14 sub-categories under Sciences and Organizations:

Astronomy (1)
Atmospheric Sciences (11)
Biology (112)
Biotechnology (10)
Botany (8)
Chemistry (6)
Ecology (31)
Geography (3)
Geology (2)
Meteorology (1)
Oceanography (8)
Ornithology (2)
Paleontology (1)
Physics (1)