If scientists had sacred objects, this would be one of them: a single, closely guarded 137-year-old cylinder of metal, housed in a vault outside of Paris. It is a prototype that precisely defines a ...

Here’s a handy chart of the units of measure we use all the time for electronic quantities. Note that the unit itself is lower case, the person it is named for is, of course, cap/lower case, and the ...

The sunflower is 214 cm tall. Calculate the height of the sunflower in metres and millimetres. There are 100 centimetres in a metre. Metres are larger than centimetres so the number of centimetres ...

When someone tells you they'll be "back in two shakes!" they are guaranteed to take much, much longer than that — at least if we're talking shakes in the sense used by physicists. The shake is a unit ...