Amongst pre-schoolers, Caillou is the fastest-ever-growing television show and is seen in close to 97% of U.S. households.

The temperature of lightning bolts is sometimes hotter than the surface of the sun.

Around three quarters of the increase in CO2 levels from human activity over the last 20 years is from the burning of fossil fuels. The rest is made up largely of land use changes such as deforestation.

AMAZING FACTS