I had to share this with you folks!

I was touring an old mansion and grounds today with my friend when we entered a room with a beautiful old Grandfather's clock in the corner.

The information about the clock shared that it was from about 1740 and that it had been re-furbished sometime in the late 19th century.

Originally, it had only the hour hand - no minute hand at all. You could see the difference in the quality and ornateness of the two hands there now.

In place of having a second hand, there were marks along the inside of the clock face at -- wait for it -- 15 minute intervals!!

If you see the implications....what counted was what hour you were in and the 15-minute interval, not all those minutes ;-)

That reminded me that of course these clocks still ring at 15-minute intervals.

So, I'm standing by my theory that humans fundamentally run by 15-minute intervals -- kind of a core psychological unit of time ;-)

If I've never shared the other evidence for this, do remind me sometime. In the meantime, keep setting those timers -- ;-)