Santa Claus may be coming to town, but how are you going to know when? Turns out there's not one, but two prominent trackers for jolly old St. Nick's progress on this upcoming Christmas Eve: one from Google, and a second from the North American Aerospace Defense Command (NORAD). But with two competing Santa trackers, how do you know where to go to get the most up-to-date information about Father Christmas?

Why is this merry fellow advertising about tuberculosis? He's on a 1924poster for that year’s "Christmas seal,"a stamp-like thing that folks could buy to stick on their mail during the winter holidays. It wasn't a postage stamp; you still had to buy that separately. It was entirely decorative, but the proceeds went to tuberculosis treatment and research centers.

Sick of dusting off the tie-dye and patchouli every year to celebrate Earth Day, the planet's most generic holiday? Us, too. So we've gathered together 10 lesser-known holidays that take a much more specific look at how humans interact with the world.

With just a few days left until Christmas, my tree is barely holding on - to its needles, to its stiffness, and to its dignity. It was an early tree this year, the result of the earliest possible Thanksgiving, but it was more than that. There was something about this tree that made it dry out quickly, and make it less likely to keep its thin needles. It is a Fraser fir, Abies fraseriis, so this was a surprise to John Frampton.

About six "Santa months," according to Larry Silverberg, a professor of mechanical and aerospace engineering at North Carolina State University. He's a Santa math specialist (really) whose students took on the problem.

Nathan Pryor at HaHa Bird has essentially won Halloween. Rather than carving a boring spooky face for trick-or-treaters to ignore, he made the gourd into a Tetris machine. There's a grid of holes on the facade and LED lights inside. Players can control the game using the stem of the pumpkin, which functions as a joystick. Waste not, want not.