lesson 3
100707-Chinese/(2010.7.7)沸腾的地球村-酷暑‘/boiling Earth’ ….’scorching heat’ a stifling day
NASA Astronaut Franklin Chang Diaz on why we should eventually turn Earth into humanity's National Park
Precession of the Ages (chart)
Harvard astronomer Dimitar Sasselov on why Earth might not be the best place for life
Habitation in Space and on Earth, 1988, Pt. 1 of 3
Habitation in Space and on Earth, 1988, Pt. 2 of 3
Flought for the day : Moderation
Pale Blue Dot In An Office
Audioboo Episode 060