DonorsChoose
Donate money directly to classrooms that need funding for science projects.
http://cosmicvariance.com/2008/10/01/donorschoose-challenge/
It looks like blogs, along with their “vassal” blogs, compete against each other to see who can rally the most financial support.
Each classroom has a description of what their project needs are, as well as their relative poverty level. Pick one, donate, finish!
Personally, I find the spectral analysis and bio themed ones particularly noteworthy. I recall “electric cars” in middle school being utterly worthless. But I figure microscopes will attract kids’ attention even if they don’t understand what’s going on. “Hey look! It’s a little moving blob! And they’re everywhere!”
From there, they can learn all about anthrax, ebola, biological warfare, etc. etc. I kid, I kid.

[...] Ron Hsu [...]