This is an amazing lesson on perspective.  It shows you what a blip we are in time, how some history and inventions overlap (that you wouldn't expect) and how far we've come in a short time.  This ten minute short sails by in what seems like a couple minutes and leaves you wanting more.

YouTube

"Our Narrow Slice" refers to the time we currently occupy in history.  You'll be surprised at the list of things that were still around or just got started in your or your parents lifetime. Be smarter today, check out this video.