Time capsules

Ok, I received an advertisement via the Internet (see left). What's that about? I thought time capsules were something kids did in the fifties to pass the time. That would be before Mr. Wizard.

I'm certainly going to pass on this -- but I just have to ask: when did my personal history become so incorporated?

Every other time I get a letter from a past self I wind up with one thought: You didn't know what the hell you were thinking when you wrote this, and you certainly don't now.

Dear Future-self - If time travel has been invented, rewind to the time I wrote this and talk me out of it. Many thanks.