http://startswithabang.com/?p=1176
Ethan Siegel: "Time slows down. We call this time dilation, and again, it works for everyone. It means that if I'm moving close to the speed of light, everyone who sees me sees that time is traveling more slowly for me: my clocks run slower, I age slower, my heart beats slower, etc. But I see the same thing: everyone else looks like their clocks are running slower, they're aging slower, etc. But if I go away close to the speed of light and then come back to Earth at Earth's speed, we find out that on my journey, although I've aged normally, much more time has passed on Earth."

So, all along, clever Siegel sees people on Earth aging slower than him but in the end he proves much younger than them! Bravo, clever Siegel! You are awe-inspiring:

http://gameknot.com/img/u/e/t/ethansiegel.jpg

Pentcho Valev