Tsunami: why and where they originate and propagate.
A trip through the Earth's history from its formation to the present tectonic motions causing earthquakes and tsunamis.
"Throughout humankind's history, we've driven species after species extinct: the passenger pigeon, the Eastern cougar, the dodo ... But now, says Stewart Brand, we have the technology (and the biology) to bring back species that humanity wiped out. So -- should we? Which ones? He asks a big question whose answer is closer than you may think."