In Which I Wax...Something...

I know this is how most of my posts start, but the other day I was thinking. I was wondering how we got our measure of time. I mean, who decided that the length of a second was a second? I was thinking about waaaay back, when they were trying to figure out how to measure this whole day thing, what constant rhythm did they have to go by? So I was sitting there thinking (caution: it gets a little semi romantic here)when I noticed my heart. Thump, thump, thump...about a second apart... And it hit me: Time is measured in heartbeats.