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SpaceX launches its first recycled rocket in historic leap

Boosters — the most expensive part of the rocket, according to Musk — typically are discarded following liftoff

NASA snaps pics of the world’s largest solar farm from space

The images were taken by NASA's Operational Land Imager on Landsat 8

This 4-meters-tall robot might soon be guarding borders

The robot is quite heavy and tall too and ends up shaking the ground when it moves

Carl Sagan explains how the ancient Greeks figured out the Earth isn’t flat, over 2,000 years ago

Sagan devoted much of his life to countering anti-science trends

C.I.A. developed tools to spy on Mac computers, WikiLeaks disclosure shows

The C.I.A. declined to comment

World’s largest artificial Sun rises in Germany (PHOTOS)

An issue we don't have in Greece

US military seeks biodegradable bullets that sprout plants

Also imperative is that animals are able to safely consume the plants that sprout from the bullets

The highlights of Australia’s Avalon Airshow! (VIDEO)

F-22, F-35, Super Hornets, C-17 and many more in a 37' spectacle!

10+1 Things you didn’t know about Air Force One (PHOTOS)

It looks like a 747 Jumbo Jet, but it so much more than that!...

If a nuclear bomb is dropped on your city, here’s where you should run and hide (Infographs+Photos)

A scientist has come up with a strategy for how to move to a better fallout shelter

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