Just when it seems like all the beasts have been captured, a hundred more types spring up from the radioactive earth every few years without fail.

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His first sensation of Earth was the smell of spring after landing in the Kazakh steppe on Tuesday, he said.

BBC: Chris Hadfield: 'Space was too good not to share it'

Just 10 companies have access to this upper echelon, but everyone else can spring for the more down-to-Earth Pro tiers today -- and with the new discounts, that's not a far-fetched possibility.

ENGADGET

As luck would have it, a project called NOvA, which should start collecting data in the spring of 2013, will send neutrinos through the Earth's crust from Batavia to an underground detector 810km away in Minnesota.

ECONOMIST: The future of physics (1)

It started with Rachel Carson's popular 1962 book on the dangers of pesticides, "Silent Spring, " and the eye on the planet increased with a photo of the Earth taken from Apollo 8 as it orbited near the moon in 1968.

CNN: STORY HIGHLIGHTS