Second Life's economy is said to be worth $200m a year, based on the goods that change hands inside the virtual avatar paradise.
But the economy is largely a pyramid scheme that is based on new players pumping in addition funds and thereby driving up overall prices. But as soon as players try to cash in, they quickly find out that their virtual profits are all hype, alleges a Randolph Harrison on his Capitalism 2.0 blog.
Some parts of Atacama have not received rainfall for 500 years - but a sudden deluge of water upset the Desert's delicate biological balance
Spitzer Space Telescope could not spot Oumuamua, suggesting that it is actually pretty small
Greenland crater one of the 25 largest impact craters on Earth
This long-sought progenitor star was identified in an image captured by Hubble in 2007