Theoretical basis for a warp drive. Sort of. Cool to think about, at any rate.
Classic photo archive. Some very striking stuff there, for example, this photo of a locomotive.
My post on risk has drawn a terrific comments thread, mostly around the medicine and politics of vaccination. (Also I'm going to address the school bus problem later, in another post.)
Today is your last day to vote in the clockpunk poll for the Mainspring [ Powell's | Amazon ] ARC contest. I'll announce winners tomorrow.
And finally, a minipoll.
Per a recent conversation with 
francitabozita, would you live forever if you could?
Absolutely!
14(17.5%)
No, I'd just like my three-score and ten, thank you.
7(8.8%)
Do I get to be eternally free and eternally young?
50(62.5%)
Is this some kind of ploy for universal healthcare?
4(5.0%)
Hah! I shall show you the error of your ways in comments, puny mortal!
5(6.2%)