This puzzle is known as the problem of time, and it remains one of the most persistent obstacles to a unified theory of ...

As the story is usually told, science began when some deep thinkers in ancient Greece decided to reject the popular mythological explanations for various natural phenomena. Those early philosophers ...

Time feels like the most basic feature of reality. Seconds tick, days pass and everything from planetary motion to human memory seems to unfold along a single, irreversible direction. We are born and ...

The International Human Frontier Science Program Organization (HFSPO) and its partners will host Fundamental Life Science Meets Climate, Environment and Sustainability, a Science Summit and ...

Raising the energy state of an atom's nucleus using a laser, or exciting it, would enable development of the most accurate atomic clocks ever to exist. This has been hard to do because electrons, ...

This article was published in Scientific American’s former blog network and reflects the views of the author, not necessarily those of Scientific American On September 1, 1939, the same day that ...