10:57The Joker is one of the oldest villains in comic book history and has undergone several iterations since 1940. Here's how the character evolved over the years.10:54How Chicago cleans 1.4 billion gallons of wastewater every day10:51Why this prototype combat rig could help Army soldiers fight a possible war with ChinaA Brit and an American tried each other's McDonald's19:49How Army Combat Medics Are Trained16:01All the differences between Little Caesars pizza in the US and the UK08:06Cleaning every part of a PlayStation 4
