Knowledge at Hand

Get answers from authoritive sources by using search interface or development API

Try For Free

Humanity most valuable knowledge sources

Scholar publications

30M+ writings spanning multiple disciplines

Books

3 million+ publicly available books covering topics from history to technology

Magazines

Daily human art spanning various epochs and topics

Manuals

Comprehensive guides on various appliances, cars, and more

PubMed

The most advanced medical database in the world

USPTO

Inventions data over many years

Wikipedia

Live articles covering every facet of humanity