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There are many unsolved in mathematics. Some prominent outstanding unsolved problems (as well as some which are not necessarily so well known) include
Motion Mountain is a free and entertaining physics textbook - 6 volumes with more than 2000 pages - for young students, teachers and anybody interested in physics. The text, guaranteed to be fascinating, surprising and challenging on every page, is...
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I've just received my Word Score, an estimate of the total number of words I know. How many words do you know?
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Short videos about numbers, maths and all sorts of other numbery stuff. We'll make you love numbers!
We have been increasingly using animations for illustrating Physics content. This page provides access to those animations which may be of general interest. The animations will appear in a separate window.
IN 1999, legendary theoretical physicist Hans Bethe delivered three lectures on quantum theory to his neighbors at the Kendal of Ithaca retirement community (near Cornell University). Given by Professor Bethe at age ...