Five brilliant military gadgets designed by students.
The surprising history of powdered alcohol.
Pictorial history of the pocket knife.
Elegant henna tattoo crowns help cancer patients cope with their hair loss.
ICYMI, Friday’s links are here, and include a marsupial that has marathon sex until it goes blind and drops dead, a smile-inducing animation of a dog searching for his boy during a zombie apocalypse, and photos of lava meeting surf.