Cool Stuff Friday 02-13-15

Happy Friday the 13th! The only remaining holiday that Hallmark doesn't have a card for (please don't disabuse me if I am wrong)! It's Mary Robinette Kowal's birthday and she's giving us gifts! Read her novelette here. Lifehacker found a tool called Twine that lets you create your own Choose Your Own Adventure stories. And this gif, via user zombiederf on Tumblr: