How Long Can Humans Hold Their Breath?

Holding your breath may not be the flashiest feat of athleticism, but performing it at its highest level is still incredibly impressive, especially since it's something we've all done, and can all relate to. The limits to which some can push breath control, in fact, are more impressive than most people probably know. » 11/19/13 7:24pm 11/19/13 7:24pm

How Smart Do You Need To Be To Collapse A Wave Function?

Here's the latest entry in our "ask the physicist" series. How do you find out if Schrodinger's Cat is alive or dead, for real? » 4/30/10 11:41am 4/30/10 11:41am

What Happens If You're Traveling At The Speed Of Light And Turn On Your…

One of the most popular questions from our "ask a physicist" feature was, "What happens if you're driving at the speed of light and you turn on your headlights?" The simple answer: You can't. So quit trying. » 4/29/10 12:46pm 4/29/10 12:46pm

If The Universe Is Expanding, What's It Expanding Into?

Last week the readers of io9 asked their most nagging questions about physics to a real-live physicist. The first question: What is the Universe expanding into? » 4/28/10 12:33pm 4/28/10 12:33pm

Ask A Physicist Any Question You Want About The Universe

This weekend you can ask a real, live physicist (me) any question you like - nothing is too stupid, or too weird. And next week, you'll get answers! » 4/23/10 4:30pm 4/23/10 4:30pm