Love quizzes? NASA astronaut Scott Kelly is holding one from the International Space Station, which orbits 220 miles above the Earth's surface. Kelly, who began his historic, year-long residence at the ISS last month, is using his amazing view to test people's geography knowledge. Starting on Wednesday, Earth Day, he will post photos of anonymous locations taken from the ISS on his Twitter feed. The first person to tweet back the right answer, along with the hashtag #spacegeo, wins that photo. Kelly will even sign each one after he returns from space. There will be plenty of chances to win a prize: The astronaut is tweeting out a new photo every Wednesday until the end of his mission. Considering the ISS circumnavigates the globe 12 times a day, Kelly will have plenty of locations to choose from. Now his Twitter followers just need to brush up on their geography.
— Keith Wagstaff