November 5, 2012 4:47
Among the threats to the Earth — asteroids, black holes, supernova explosions … but scientists still can not agree on how to save our planet. Why?
Surviving in the city. Survival in a world
November 5, 2012 4:47
Among the threats to the Earth — asteroids, black holes, supernova explosions … but scientists still can not agree on how to save our planet. Why?