The Week In Numbers: A Bionic Pancreas, A Universal Water Purifier, And More

Slingshot Water Purifier Popular Science 250,000 liters: the volume of water a single, mini-fridge-size Slingshot machine purifies in one year. That's enough for about 300 people. Slingshots are able to purify even seawater and sewage. 288: the number of times a day this experimental bionic pancreas checks the blood-sugar level of its wearer. 60 hours: how long it took Popular Science contributing writer Douglas Main to travel to the Tambopata Research Center in Peru. There, he learned about the...