All this week, the origin and continued preservation of five of our favorite standard units of measure
By Sam Kean
Posted 11.04.2010 at 11:53 am 9 Comments
This week, Sam Kean takes a look at some ridiculously precise standards -- the meter, the second, and other international standard units -- and the role that elements have played in defining, redefining, and re-redefining them over the ages.
We all have an intuitive idea of what a meter or a second is, and even a candela seems pretty straightforward. The mole is different, probably the hardest metric standard to grasp at first.
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.