Physicists are fond of Gedankenexperimente—thought experiments that are difficult or impossible to perform in the real world. Schrödinger’s cat is a well-known example of a thought experiment, used to ...
Long before humans evolved, a small eel shaped creature swimming in ancient seas carried eyes that look strikingly familiar.
Around 410 million years ago terrestrial life was relatively simple. There were no forests or prairies—land was largely dominated by slimy microbial mats. The types of plants that would eventually ...