Based on
this and the comments to it, I have been inspired to devise a pop science challenge.
Non-scholarly science non-fiction books only. Don't count things you've already read. You may count books that you read for other challenges here too.
Levels: Unless you're reading for comps or a dissertation, the Silver (47 books), Gold (79 books), and Platinum (78 books) awards seem rather unreasonable. Instead, we'll be going for these elements:
1 Hydrogen
2 Helium
3 Lithium
4 Beryllium
5 Boron
6 Carbon
7 Nitrogen
8 Oxygen
9 Fluorine
10 Neon
11 Sodium
12 Magnesium
You have 6 months from the time you sign up here. The rest of us doing this would love to see what you've chosen, how you're doing, and what you think if what you've read, so please keep us updated in the comments or link to an entry in your journal where you'll blog about your progress.