Around 3.26 billion years ago — long before the dinosaurs — a massive asteroid measuring nearly 36 miles (58 km) across smashed into the Earth. Geologists have now reconstructed this cataclysmic event, and it was far, far bigger than we thought. Here's how things went down on that fateful day.
So weird. This iRobot Packbot has a Situational Awareness Mast built-in, a surveillance system which can grow from 25 inches to 20 feet lifting 200 pounds, on its top configuration. The mechanism is very ingenious: