The slightest whisper of warmth induces miscalculations in the world’s most precise atomic clock, researchers say. Accounting for this effect can make future clocks even more precise, eventually leading to atomic clocks that lose only one second every 32 billion years — about two and a half times the age of the universe itself.
Make winter nights brighter with a holiday-hued hearth
By Theodore Gray
Posted 11.14.2007 at 3:00 am 2 Comments
Wood fires are yellow, right? Well, typically, but not necessarily. All hot bodies emit "black body" radiation in a color spectrum that depends on temperature: red for fairly hot, orange for hotter, yellow for really quite hot, all the way up through white for, well, white-hot. Most wood fires burn at about yellow-hot.
Five amazing, clean technologies that will set us free, in this month's energy-focused issue. Also: how to build a better bomb detector, the robotic toys that are raising your children, a human catapult, the world's smallest arcade, and much more.