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Databases and Research

Resources available 24/7

Aurora Public Library offers various online resources that you can access anytime, anywhere.  Download eBooks, digital magazines, stream music and movies, learn a new language or skill or even get homework help from a live tutor. Please have your Aurora Public Library Card number and PIN available to access the digital library.


*available inside the library only.

Databases
Automobile Repair
Chilton (Auto Repair) Service Manuals
Do-it-yourselves total maintenance, service, and repair information in an easy-to-use format for your cars.
LinkedIn Learning Library

Books & Reading
Novelist
Search categories listing Best Sellers, Awards, Mysteries, Inspirational, Younger Readers, Article Archive, NoveList Letters.
Novelist K-8
Contains information on fiction books for all K-8 grade levels and includes picture books, children's "chapter" books and young adult titles.
WorldCat
Locate books, periodicals, films, maps, sound recordings, and other formats in thousands of libraries worldwide.
Business & Investing
Linkedin Learning Library
Provides an extensive library of training videos on practically any software program imaginable, including business productivity programs like Microsoft Office (Word, Excel, PowerPoint, etc.), professional design software such as Adobe's Creative Suite (Photoshop, Illustrator, After Effects, etc.), audio and video production, mobile platforms (iOS, Andriod, etc.) and so much more. The Library's LinkedIn Learning Library (LLL) membership offers customers unlimited access to a library of over 100,000 high-quality, current, and engaging video tutorials as part of over 2,000 courses taught by recognized industry experts. You can also access it via the "Learning" app - our LibraryID is - apldaurorail and you can login with a valid APLD library card and PIN.
Morningstar Investment Research Center
Find a stock or mutual fund, research current or prospective holdings, read analysts' reports, and see ratings, financial reports, valuation ratios, and key ratios.
Public Records
Access to Chicagoland's public records. Real estate transactions, mortgages, foreclosures, and more. Keep an eye on housing values in your community and help safeguard your biggest investment - your home. Sort by name, city, zip code, and more.
AtoZ Databases
The premier source of business information for reference and research, with detailed information on more than 25 million U.S. businesses. Used by entrepreneurs, businesses, students, job-seekers, or anyone wanting access to information on businesses.
Value Line

A complete online investment research system that comprises all the financial information and analytical tools needed to structure a well-researched and diversified portfolio.
Consumer Reports Online
Read trusted product reviews of Consumer Reports online without paying the subscription fee with you APLD Library card.
Digital Books
Hoopla
Instantly borrow up to four (4) titles per month of your choice from movies, music albums, eBooks, audiobooks, TV series, or comics.
Tumblebook Library
A collection of TumbleBooks (animated, talking picture books), TumblePuzzles, TumbleQuizzes and TumbleResources for Teachers.
Overdrive
eBooks & eAudiobooks: Checkout of digital ebooks and downloadable audiobooks that are compatible with iPhone, iPad, Android, Amazon Kindle Fire, and other popular mobile devices. Formats include EPUB and PDF for eBooks, and MP3 and WMA for eAudiobooks. – download the Libby APP by Overdrive.
Español
De la A a la Z Base de datos
Es la fuente principal de información comercial para referencia e investigación. Tiene información detallada sobre mas de 25 millones de empresas estadounidenses. Para emprendedores, empresas, estudiantes, solicitantes de empleo, o cualquier persona que desee acceder a información sobre empresas.
Brainfuse Ayuda Ahora
Ofrece herramientas de aprendizaje electrónico. Incluyen tutoría en vivo, asistencia de expertos para escribir, aprendizaje colaborativo, desarrollo de habilidades específicas, preparación para exámenes y opciones de autoaprendizaje. Hay tutores en vivo disponibles después del horario escolar, partir de las 3:00 pm a las 10:00 pm.
Informes de Consumidores en Linea
Es una base de datos que proporciona calificaciones, reseñas, recomendaciones y consejos de compra para muchos productos y servicios como automóviles, electrodomésticos, productos electrónicos y más.
Freegal
Ofrece acceso a 3 millones de canciones, incluyendo el catálogo de artistas legendarios de Sony Music. Tiene una colección de más de 10,000 compañías de música que se origina en más de 60 países. No se requiere software para descargar música gratis de DRM.
LearningExpress Library
Proporciona una plataforma de aprendizaje en línea interactiva. Tiene pruebas de practica y cursos tutoriales diseñados para ayudar a los clientes, estudiantes adolescentes y estudiantes adultos a tener éxito en los exámenes académicos o profesionales
LinkedIn Learning Library
Proporciona una extensa biblioteca de videos sobre prácticamente cualquier programa de software imaginable, incluyendo programas de productividad empresarial como las aplicaciones de “Microsoft Office” (Word, Excel, Powerpoint, y más), las aplicaciones de diseño profesional como “Adobe Creative Cloud” (Photoshop, Illustrator, After Effects y más), producción de audio y video, plataformas móviles (iOS y Android) y mucho más. La membresía de la biblioteca ofrece a los clientes acceso ilimitado a más de 100,000 videos tutoriales de alta calidad. También cuenta con 2,000 cursos impartidos por expertos de la industria.
MasterFile Premier
Encuentra a más de 1000 periódicos, revistas y diarios. Los Informes de los Consumidores se pueden encontrar usando esta base de datos
Medline Plus
Un base de datos de información sobre la salud y medicina de la biblioteca médica más grande del mundo, la Biblioteca Nacional de Medicina
OverDrive
Una plataforma de libros electrónicos y audiolibros. Compatibles con iPhone, iPad, Android, Kindle de Amazon, y otros dispositivos móviles populares. Los formatos incluyen EPUB y PDF para libros electrónicos y MP3 y WMA para libros de audio electrónicos. También se puede descargar la aplicación “Libby de Overdrive”
Press Reader
Una plataforma donde puedes descargar tus revistas y periódicos favoritos.
Mango Languages
Un manera divertida y fácil de aprender cualquiera de los 70 idiomas. ¡Es gratis en tu biblioteca y comienza a aprender a tu propio ritmo!
Tumblebook Library
Una colección de “TumbleBooks.” TumbleBooks son libros con imágenes animadas. También tienen rompecabezas, pruebas, y recursos para maestros y profesores.
WorldCat
Una base de datos para buscar libros, publicaciones periódicas, películas, mapas, grabaciones de sonido y otros formatos de miles de bibliotecas en todo el mundo.
Genealogy & Local History
Ancestry Library Edition*
Powered by Ancestry.com, the number 1 Source for Family History Online.
Beacon News Collection
Full-color digital archive of the Beacon News beginning 1997.
Chicago Community Collection
Explore and stay informed on local topics, people and events in areas such as business, health, education, jobs and careers, political and social issues and more.
HeritageHub
Explore your family history with the premier collection of U.S. obituaries and death notices for in-depth genealogical research from 1704 – today
Local Indexes
Find local indexes on our Genealogy and Local History web page, including the Beacon Obituary Index.
Health & Medicine
Medline
Produced by the National Library of Medicine and corresponds to the following print resources: Index Medicus, Index to Dental Literature, and International Nursing Index. Use it to find studies and articles on all areas of medicine.
Medline Plus
A database of good health and medicine information from the world's largest medical library, the National Library of Medicine.
Jobs & Careers
JobNow
Offers expert live assistance in a one-on-one setting where you can explore how to build an effective résumé, the kinds of questions that will arise during a job interview, or the best steps to take towards the career you are interested in.
AtoZ Databases
The premier source of business information for reference and research, with detailed information on more than 25 million U.S. businesses. Used by entrepreneurs, businesses, students, job-seekers, or anyone wanting access to information on businesses.
Language Learning
Mango Languages
Fun and easy way to learn any of 70 languages. It’s free at your library and start learning at your own pace!
Magazines & Newspapers
Beacon News Collection
Full-color digital archive of the Beacon News beginning 1997.
Chicago Community Collection
Explore and stay informed on local topics, people and events in areas such as business, health, education, jobs and careers, political and social issues and more.
Consumer Reports Online
Provides ratings, reviews, recommendations and buying advice for thousands of products and services, including cars, appliances, electronics, and more.
Chicago Tribune
Chicago Tribune full-text articles (1985-present).
Chicago Tribune - Historical
Content includes articles between 1849-1987. The collection includes digital reproductions providing access to every page from every available issue.
MasterFile Premier
Searches 1000+ newspapers, magazines, and journals. The Consumer Reports can be found using this database.
Press Reader
Magazines and Newspapers. Unlimited Downloads.
Music Downloadables
Freegal
Offers access to 3 million songs, including Sony Music’s catalogue of legendary artists. In total, collection of 10,000+ labels with music that originates in over 60 countries. No software required to download DRM free Music.
Hoopla
Instantly borrow up to four (10) titles per month of your choice from movies, music albums, eBooks, audiobooks, TV series, or comics.
Online Learning
APLD Niche Academy
Easy to use How-to videos introducing 30+ popular library apps like Live-Homework help, Consumer Reports Online, Ancestry, Value Line, and Libby.
Creative Bug
Offers creative inspiration with 1000+ online art and crafts classes and expert step-by-step instructions. Also offers patterns, templates, recipes and more.
HelpNow
Offers a comprehensive suite of eLearning tools, including live tutoring, expert writing assistance, collaborative learning, targeted skills building, test prep, and self-study options. Live tutors available after school hours, from 3:00 p.m. to 10:00 p.m.
Learning Express Library
Provides a completely interactive online learning platform of practice tests and tutorial courses designed to help customers, teen students, and adult learners alike succeed in required academic or professional exams.
Linkedin Learning Library
Provides an extensive library of training videos on practically any software program imaginable, including business productivity programs like Microsoft Office (Word, Excel, PowerPoint, etc.), professional design software such as Adobe's Creative Suite (Photoshop, Illustrator, After Effects, etc.), audio and video production, mobile platforms (iOS, Andriod, etc.) and so much more. The Library's LinkedIn Learning Library (LLL) membership offers customers unlimited access to a library of over 100,000 high-quality, current, and engaging video tutorials as part of over 2,000 courses taught by recognized industry experts. You can also access it via the "Learning" app - our LibraryID is - apldaurorail and you can login with a valid APLD library card and PIN.
Research & Homework Help
Biography In Context
Learn about the challenges, motivations, successes, and failures of historical and contemporary persons.
Gale eBooks
A database of encyclopedias, digital books, and specialized reference sources for multidisciplinary research.
HelpNow
Offers a comprehensive suite of eLearning tools, including live tutoring, expert writing assistance, collaborative learning, targeted skills building, test prep, and self-study options. Live tutors available after school hours, from 3:00 p.m. to 10:00 p.m.
MasterFile Premier
Searches 1000+ newspapers, magazines, and journals. The Consumer Reports can be found using this database.
Opposing Viewpoints In Context
Premier online resource covering today's hottest social issues, from capital punishment to immigration, to violent video games.
Learning Express Library
Provides a completely interactive online learning platform of practice tests and tutorial courses designed to help customers, teen students, and adult learners alike succeed in required academic or professional exams.
Streaming Movies
Hoopla
Instantly borrow up to four (4) titles per month of your choice from Movies, Music albums, eBooks, Audiobooks, TV Series or comics.
Test Prep & Skill Building
LearningExpress Library
Provides a completely interactive online learning platform of practice tests and tutorial courses designed to help customers, teen students, and adult learners alike succeed in required academic or professional exams.
Linkedin Learning Library (LLL)
Provides an extensive library of training videos on practically any software program imaginable, including business productivity programs like Microsoft Office (Word, Excel, PowerPoint, etc.), professional design software such as Adobe's Creative Suite (Photoshop, Illustrator, After Effects, etc.), audio and video production, mobile platforms (iOS, Andriod, etc.) and so much more. The Library's LinkedIn Learning Library (LLL) membership offers customers unlimited access to a library of over 100,000 high-quality, current, and engaging video tutorials as part of over 2,000 courses taught by recognized industry experts. You can also access it via the "Learning" app - our LibraryID is - apldaurorail and you can login with a valid APLD library card and PIN.
HelpNow
Offers a comprehensive suite of eLearning tools, including live tutoring, expert writing assistance, collaborative learning, targeted skills building, test prep, and self-study options. Live tutors available after school hours, from 3:00 p.m. to 10:00 p.m.
Search the Catalogues
WorldCat
Locate books, periodicals, films, maps, sound recordings, and other formats in thousands of libraries worldwide.
Library Catalouge
Search the library catalogue for APL owned items.
Children's Databases
Novelist K-8
Contains information on fiction books for all K-8 grade levels and includes picture books, children's "chapter" books and young adult titles.
Homework HelpNow
Offers a comprehensive suite of eLearning tools, including live tutoring, expert writing assistance, collaborative learning, targeted skills building, test prep, and self-study options. Live tutors available after school hours, from 3:00 p.m. to 10:00 p.m.
Learn a new language - Pronunciator
Fun and easy way to learn any of 80 languages. It’s free at your library and start learning at your own pace!
Linkedin Learning Library
Provides an extensive library of training videos on practically any software program imaginable, including business productivity programs like Microsoft Office (Word, Excel, PowerPoint, etc.), professional design software such as Adobe's Creative Suite (Photoshop, Illustrator, After Effects, etc.), audio and video production, mobile platforms (iOS, Andriod, etc.) and so much more. The Library's LinkedIn Learning Library (LLL) membership offers customers unlimited access to a library of over 100,000 high-quality, current, and engaging video tutorials as part of over 2,000 courses taught by recognized industry experts. You can also access it via the "Learning" app - our LibraryID is - apldaurorail and you can login with a valid APLD library card and PIN.
Learning Express Library
Provides a completely interactive online learning platform of practice tests and tutorial courses designed to help customers, teen students, and adult learners alike succeed in required academic or professional exams.
Biography In Context
Learn about the challenges, motivations, successes, and failures of historical and contemporary persons.
PebbleGo & PebbleGo Next
Makes learning fun by offering educational resources for grades PreK-2 on popular topics such as Animals (in English and Spanish), Science, Biographies, Social Studies, and Dinosaurs. PebbleGo teaches reading and research skills through the use of read along audio, text highlighting, educational games, and multimedia resources.
Teachables (Scholastics)
Online Hub of 30,000 Ready-to-Use Printable Learning Resources for Every Subject | PreK-6.

A

Ancestry Library Edition: Powered by Ancestry.com, the number 1 Source for Family History Online.  (Available inside of the library only)

AtoZ Databases: The premier source of business information for reference and research, with detailed information on more than 25 million U.S. businesses. Used by entrepreneurs, businesses, students, job-seekers, or anyone wanting access to information on businesses. [Watch a quick video tutorial to get started.]

¡Disponible en Español! - “De la A a la Z” Base de datos
Es la fuente principal de información comercial para referencia e investigación. Tiene información detallada sobre mas de 25 millones de empresas estadounidenses. Para emprendedores, empresas, estudiantes, solicitantes de empleo, o cualquier persona que desee acceder a información sobre empresas.   

B

Beacon News Collection: Explore Aurora history through local news, events and people with the Beacon News Collection. Search current and archived issues with full-color newspaper pages, full-text articles, and content only published online. Available remotely 24/7 on any device. Archival issues prior to 1997 are available on microfilm. Please see a librarian for assistance.

Biography In Context: Learn about the challenges, motivations, successes, and failures of historical and contemporary persons.

Brainfuse - HelpNow: offers a comprehensive suite of eLearning tools, including live tutoring, expert writing assistance, collaborative learning, targeted skills building, test prep, and self-study options.  Live tutors available after school hours, from 3:00 p.m. to 10:00 p.m. [Watch a quick video tutorial to get started.]

¡Disponible en Español! - “Brainfuse HelpNow” – Brainfuse Ayuda Ahora
Ofrece herramientas de aprendizaje electrónico. Incluyen tutoría en vivo, asistencia de exp
ertos para escribir, aprendizaje colaborativo, desarrollo de habilidades específicas, preparación para exámenes y opciones de autoaprendizaje. Hay tutores en vivo disponibles después del horario escolar, partir de las 3:00 pm a las 10:00 pm.

C

Chicago Community Collection: Explore and stay informed on local topics, people and events in areas such as business, health, education, jobs and careers, political and social issues and more.

Chicago Tribune- Historical: Content includes articles between 1849-1987. The collection includes digital reproductions providing access to every page from every available issue.

Chicago Tribune: Chicago Tribune full-text articles (1985-present).

Chilton (Auto Repair) Service Manuals: Do-it-yourselves total maintenance, service, and repair information in an easy-to-use format for your cars.

Consumer Reports Online: Provides ratings, reviews, recommendations and buying advice for thousands of products and services, including cars, appliances, electronics, and more.  [Watch a quick video tutorial to get started.]

¡Disponible en Español! - Informes de Consumidores en Línea

Es una base de datos que proporciona calificaciones, reseñas, recomendaciones y consejos de compra para muchos productos y servicios como automóviles, electrodomésticos, productos electrónicos y más.

Creative Bug: Offers creative inspiration with 1000+ online art and crafts classes and expert step-by-step instructions. Also offers patterns, templates, recipes and more. [Watch a quick video tutorial to get started.]

F

Freegal: Offers access to 3 million songs, including Sony Music’s catalogue of legendary artists.  In total, collection of 10,000+ labels with music that originates in over 60 countries.  No software required to download DRM free Music. [Watch a quick video tutorial to get started.]

¡Disponible en Español! - Freegal - Una plataforma de música
Ofrece acceso a 3 millones de canciones, incluyendo el catálogo de artistas legendarios de Sony Music. Tiene una colección de más de 10,000 compañías de música que se origina en más de 60 países. No se requiere software para descargar música gratis de DRM.

G

Gale eBooks: A database of encyclopedias, digital books, and specialized reference sources for multidisciplinary research.


H

HelpNow: offers a comprehensive suite of eLearning tools, including live tutoring, expert writing assistance, collaborative learning, targeted skills building, test prep, and self-study options.  Live tutors available after school hours, from 3:00 p.m. to 10:00 p.m.

HeritageHub: Explore your family history with the premier collection of U.S. obituaries and death notices for in-depth genealogical research from 1704 – today. HeritageHub helps you easily identify relatives, uncover new information and potentially unknown family members. Includes deep coverage from all 50 states, hard-to-find content from the mid 1900’s, and original obituary images. Access is available 24/7.

Hispanic Life in America: The experience and impact of Hispanic Americans as recorded by the news media, 1704 to today.

Hoopla: Instantly borrow up to four (4) titles per month of your choice from movies, music albums, eBooks, audiobooks, TV series, or comics.          [Watch a quick video tutorial to get started.]

J

JobNow - Brainfuse : Offers expert live assistance in a one-on-one setting where you can explore how to build an effective résumé, the kinds of questions that will arise during a job interview, or the best steps to take towards the career you are interested in.

L

LearningExpress Library: Provides a completely interactive online learning platform of practice tests and tutorial courses designed to help customers, teen students, and adult learners alike succeed in required academic or professional exams.

¡Disponible en Español! - LearningExpress Library- Una plataforma de aprendizaje en línea
Proporciona una plataforma de aprendizaje en línea interactiva. Tiene pruebas de practica y cursos tutoriales diseñados para ayudar a los clientes, estudiantes adolescentes y estudiantes adultos a tener éxito en los exámenes académicos o profesionales


Libby: eBooks & eAudiobooks: Checkout of digital ebooks and downloadable audiobooks that are compatible with iPhone, iPad, Android, Amazon Kindle Fire, and other popular mobile devices. Formats include EPUB and PDF for eBooks, and MP3 and WMA for eAudiobooks. – download the Libby App.
¡Disponible en Español! -[Watch a quick video tutorial to get started.Libby

Una plataforma de libros electrónicos y audiolibros.  Compatibles con iPhone, iPad, Android,  Kindle de Amazon, y otros dispositivos móviles populares. Los formatos incluyen EPUB y PDF para libros electrónicos y MP3 y WMA para libros de audio electrónicos. También se puede descargar la aplicación “Libby de Overdrive”

Linkedin Learning Library: Provides an extensive library of training videos on practically any software program imaginable, including business productivity programs like Microsoft Office (Word, Excel, PowerPoint, etc.), professional design software such as Adobe's Creative Suite (Photoshop, Illustrator, After Effects, etc.), audio and video production, mobile platforms (iOS, Andriod, etc.) and so much more. The Library's LinkedIn Learning Library (LLL) membership offers customers unlimited access to a library of over 100,000 high-quality, current, and engaging video tutorials as part of over 2,000 courses taught by recognized industry experts.

¡Disponible en Español! - LinkedIn Learning Library – Una Plataforma de la empresa LinkedIn que tiene videos de aprendizaje en línea
Proporciona una extensa biblioteca de videos sobre prácticamente cualquier programa de software imaginable, incluyendo programas de productividad empresarial como las aplicaciones de “Microsoft Office” (Word, Excel, Powerpoint, y más), las aplicaciones de diseño profesional como “Adobe Creative Cloud” (Photoshop, Illustrator, After Effects y más), producción de audio y video, plataformas móviles (iOS y Android) y mucho más. La membresía de la biblioteca ofrece a los clientes acceso ilimitado a más de 100,000 videos tutoriales de alta calidad. También cuenta con 2,000 cursos impartidos por expertos de la industria.

M


Mango Languages: Mango offers access to over 70 foreign language courses and 20 ESL courses. Mango can be accessed at the library, remotely, or even on-the-go with apps for iPhone® and Android™.

MasterFile Premier: Searches 1000+ newspapers, magazines, and journals. The Consumer Reports can be found using this database.

¡Disponible en Español! - MasterFile Premier - Una Plataforma de periódicos, revista y diarios
Encuentra a más de 1000 periódicos, revistas y diarios. Los Informes de los Consumidores se pueden encontrar usando esta base de datos, haz cliq en donde dice Languages para cambiar la página web en Español.

Medline: Produced by the National Library of Medicine and corresponds to the following print resources: Index Medicus, Index to Dental Literature, and International Nursing Index. Use it to find studies and articles on all areas of medicine.

Medline Plus: A database of good health and medicine information from the world's largest medical library, the National Library of Medicine.

¡Disponible en Español! -  Medline Plus
Un base de datos de información sobre la salud y medicina de la biblioteca médica más  grande del mundo, la Biblioteca Nacional de Medicina

Morningstar Investment Research Center: Find a stock or mutual fund, research current or prospective holdings, read analysts' reports, and see ratings, financial reports, valuation ratios, and key ratios. View the 30 days to Financial Fitness guide here!

N

APLD Niche Academy: Easy to use How-to videos introducing 30+ popular library apps like Live-Homework help, Consumer Reports Online, Ancestry, Value Line, and Libby.
Novelist: Search categories listing Best Sellers, Awards, Mysteries, Inspirational, Younger Readers, Article Archive, NoveList Letters.
Novelist K-8: Contains information on fiction books for all K-8 grade levels and includes picture books, children's "chapter" books and young adult titles.

O

Opposing Viewpoints In Context: Premier online resource covering today's hottest social issues, from capital punishment to immigration, to violent video games.

P

PebbleGo & PebbleGo Next: Makes learning fun by offering educational resources for grades PreK-2 on popular topics such as Animals (in English and Spanish), Science, Biographies, Social Studies, and Dinosaurs. PebbleGo teaches reading and research skills through the use of read along audio, text highlighting, educational games, and multimedia resources.


Press Reader: Download your favorite magazines and newspapers.  

¡Disponible en Español! - PressReader
Una plataforma donde puedes descargar tus revistas y periódicos favoritos.

Pronunciator: fun and easy way to learn any of 80 languages. It’s free at your library and start learning at your own pace!

¡Disponible en Español! - Pronunciator - Una plataforma de aprendizaje de idiomas
Un manera divertida y fácil de aprender cualquiera de los 80 idiomas. ¡Es gratis en tu biblioteca y comienza a aprender a tu propio ritmo!

Public Records: Access to Chicagoland's public records. Real estate transactions, mortgages, foreclosures, and more. Keep an eye on housing values in your community and help safeguard your biggest investment - your home. Sort by name, city, zip code, and more.

T

Tumblebook Library: A collection of TumbleBooks (animated, talking picture books), TumblePuzzles, TumbleQuizzes and TumbleResources for Teachers.
¡Disponible en Español! - Una biblioteca de libros “TumbleBooks”
Una colección de “TumbleBooks.” TumbleBooks son libros con imágenes animadas. También tienen rompecabezas, pruebas, y recursos para maestros y profesores.

Teachables (Scholastics): An Online Hub of 30,000 Ready-to-Use Printable Learning Resources for Every Subject | PreK-6.

V

Value Line: Provides information and advice on over 6,000 stocks, 18,000 mutual funds, 200,000 options and other securities. [Watch a quick video tutorial to get started.]

 

W

WorldCat: Locate books, periodicals, films, maps, sound recordings, and other formats in thousands of libraries worldwide.

¡Disponible en Español! - WorldCat
Una base de datos para buscar libros, publicaciones periódicas, películas, mapas, grabaciones de sonido y otros formatos de miles de bibliotecas en todo el mundo.