Millions of years of evolution have enabled some marine animals to grow complex protective shells composed of multiple layers ...

Physics and Python stuff. Most of the videos here are either adapted from class lectures or solving physics problems. I ...

Physics and Python stuff. Most of the videos here are either adapted from class lectures or solving physics problems. I ...

Scientists may have found a hidden source of clean energy right in the Earth, and it could power the world for thousands of ...

Listen to the first notes of an old, beloved song. Can you name that tune? If you can, congratulations—it's a triumph of your ...