According to Steve Anderson, a retired brigadier general who served as Gen. Petraeus' chief logistician in Iraq, the Department of Defense spends $20 billion air conditioning tents and temporary structures for the military. That's more than NASA's entire $19 billion annual budget.

Robert Harrison, 38, used a collection of cheap parts costing £500 to create a balloon-mounted camera that can travel up to 21.7 miles (35km) above the surface of the Earth. The result is a series of pictures taken from a height that only a rocket or weather balloon can reach. The resulting photographs, which he published online, were so impressive that Nasa has been in touch.