Passengers on the Beijing subway can pay with plastic bottles.
29
Harvard earns enough money from interest on its endowment that it could offer free tuition to every student and still profit.
13
There are approximately three million shipwrecks on the ocean floor, worth billions in value and treasure.
22
Not swinging your arms when you walk increases the effort of walking by 12%, the equivalent of walking 20% faster or carrying a 10 kg backpack.
12
The largest hotel suite in the world is located 22 stories under the surface in the Grand Canyon Caverns. One night for two people in this 65 million year old cave is $700.
4
Every year around 1 billion Valentine cards are sent. After Christmas it's a single largest seasonal card-sending occasion.
14
20252 is Smokey the Bear's own zip code.
35