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Physics3999 articles archived since 1845

Math Cracks a Knuckle-Cracking Mystery

The source of knuckle cracking sounds is much debated—but new mathematical models may reconcile two opposing views. Christopher Intagliata reports.

March 29, 2018 — Christopher Intagliata

How Do We Measure Time? 5+ Innovative Ways

How do we measure time? How accurate are today’s clocks relative to the first clocks of ancient times? And what is the definition of a second?

March 21, 2018 — Everyday Einstein Sabrina Stierwalt

The Nature of Space and Time

Two relativists present their distinctive views on the universe, its evolution and the impact of quantum theory

March 14, 2018 — Stephen W. Hawking and Roger Penrose

The Elusive Theory of Everything

Physicists have long sought to find one final theory that would unify all of physics. Instead they may have to settle for several

March 14, 2018 — Stephen Hawking and Leonard Mlodinow

Searching the Heavens for Mountains

Exoplanet hunters are moving beyond simply finding new planets into trying to know what they look like and whether there's surface or subsurface activity.  

March 9, 2018 — Julia Rosen

The Physics of Figure Skating

Let’s break down some of the crucial elements behind figure skating's moves, like the loop, flip, salchow, axel, and lutz

February 24, 2018 — Everyday Einstein Sabrina Stierwalt

Complex Causes. Alternative Solutions.