Some numbers don't change. These values are deeply connected to the very fabric of the universe and our human existence. Until they aren't, of course. Then we change them - for good reason.
Tagged With kilogram
Stop the presses! Physicists at the National Institute of Standards and Technology have made a new measurement of Planck's constant to a highly accurate degree. It's the latest step toward improving the official definition of the kilogram, the unit of mass that underpins our entire international system of weights and measures.