Science!
Pictures here are from some of these microscopy sites (although one is gone from the list) and Astronomy Picture of the Day. Brush and gradient credits are still on my userinfo.
Darwin/evolution: 1.
2.
3.
4.
5.
Plants: 6.
7.
8.
9.
Microscopy: 10.
11.
12.
Space: 13.
14.
15.
16.
17.
18.
Click here to watch for more kniticons
Darwin/evolution: 1.
2.
3.
4.
5.
Plants: 6.
7.
8.
9.
Microscopy: 10.
11.
12.
Space: 13.
14.
15.
16.
17.
18.
Click here to watch for more kniticons