Some Canadian universities have free online courses that you can take now. You don't have to be a current student or have any ...

For more than a century, gravity has been the stubborn outlier in physics, resisting every attempt to merge Einstein’s smooth ...

According to the theory, our reality is encoded on the boundary of a black hole within a much larger universe.

Time feels like the most familiar thing in the world, yet it hides one of physics’ hardest questions: why do we only remember ...

I have moved all the original BASIC source code into a folder for each project in the original book (first volume). Note that Lyle Kopnicky has generously normalized all the code (thanks Lyle!) to run ...

Ask the publishers to restore access to 500,000+ books. An icon used to represent a menu that can be toggled by interacting with this icon. A line drawing of the Internet Archive headquarters building ...