16Entry by jaoafallas
15Entry by Busteq
Remember back in grade school when someone being all science-y would stroll in with a big piece of wood and would use its rings to show you when historical events happened? Because, like, trees are old and shit?
Well there's other old shit out there that shows the passage of time and are a helluva lot cooler than a piece of wood.
(Shout out to Tomkat53 for the contest suggestion.)