Knowledge
A gateway to global information and frontier science. Exploring the tools and theories that expand the boundaries of human understanding.
Level 1
Project Gutenberg: a library of 75,000 free classic books online, made by volunteers
Project Gutenberg is a long running online library that gives free access to classic books in digital form. It focuses…

Learning multiple new skills can produce test scores comparable to adults 30 years younger
Older adults who learn multiple new skills simultaneously can achieve cognitive performance similar to adults 30 years younger. A UC Riverside study found that 3 months of intensive learning improved memory, attention, and cognitive control, with gains maintained up to one year later.
Level 2
PDFBooksWorld: free online reading of public domain books, downloads need a paid membership
PDFBooksWorld is a digital library and publisher that focuses on books in the public domain, which means works whose copyrights…
RefSeek: a Web search engine for students and researchers
Academic Resource Search. More than a billion sources: encyclopedia, monographies, magazines. RefSeek is a Web search engine made for students…
Stopping at a clear next step helps you finish work, as shown by classic psychology and a new “Hemingway effect”
Ernest Hemingway advised writers to stop when they are still going well and know what will happen next, so it…
Level 3
Bookboon: a simple on demand library for workplace learning
“Access Bookboon” offers short eBooks, audio lessons, and live online classes that help people learn practical skills at work. Topics…
Obooko: download free, legal ebooks with no fees
Obooko is a website where readers can download ebooks in English at no cost, in PDF, EPUB, or Kindle formats.…
SpringerLink: access to more than 10 million scientific documents, books, articles, research protocols
SpringerLink is an online platform that brings together research journals, books, reference works and laboratory protocols, step by step methods…
Worldcat.org: a search for the contents of 20,000 worldwide libraries
Find out where lies the nearest rare book you need WorldCat is a global library catalog provided by OCLC, a…
The self might be an illusion or a quantum process, say experts
Sam Harris and Roger Penrose debate if the self is real. Harris calls it an illusion, while Penrose looks to quantum physics and split brains.
AI will speed up scientific research far more than most people expect
Google DeepMind’s Joëlle Barral argues that AI is about to change how science is done, not just how fast papers…