QUESTION YOUR WORLD: How many people live on Earth?

Population 7 Billion! - Question Your World by ScienceMuseumofVA

There's a pretty good chance that you've seen some other people today somewhere. Well, we are currently ushering in a new milestone for humanity, 7 billion people. That's right, the Earth is home to 7 billion of us. This is most impressive considering that it took us nearly 199,000 years to get from very few of us to 1 billion of us. 1804 marked the year when humanity reached the billions. The thought of 1 billion people in 1804 is pretty interesting, but pails in comparison to the exponential growth that our population saw soon after. Check out how we grew from 1 billion to 7 billion:
1804 - After nearly 200,000 years we reached 1 billion
1930 - 2 billion
1960 - 3 billion!
1974 - 4 Billion!!
1987 - 5 BILLION!!!
1999 - 6 BILLION!!!!!!
2011 - 7 BILLION!!!!!!!!!!

So nearly 199,000 years to get to 1 billion and only 207 years to get to 7 billion! That's some exceptional exponential growth!
http://www.worldof7billion.org - Follow the countdown and get more information on this growing population's impact on our world!

Neptune

A lot has been discovered about Neptune since its initial sighting in 1846. The Voyager 2 spacecraft, on Aug 25, 1989, did a fly by of this blue celestial giant and sent back some photos and other data that has helped the science community understand more about the last planet on the block. Here are some interesting factoids about Neptune:
8th Planet from the sun
Gaseous Giant
13 Moons
Named after the Roman god of the oceans, Neptune
Has rings…just like all the other gaseous giants
2.68 BILLION miles from Earth at its closest point in orbit
60,190 Earth days (164.8 Earth years) for Neptune to orbit the sun once!!
Looks cool…because it is VERY cool…as in cold -330F (72 Kelvin)…(-201 C for the non-US friends of the Science Museum of Virginia)…brrr!
After 2006's demotion of Pluto, this blue gaseous giant became the last official planet in our solar system.