This is the first time I've seen it, and I quite enjoyed it.
It will also (rightfully, it's fantastic) make you look for the Ignition! PDF, because it's not every day you read a paragraph introduced with:
> It is, of course, extremely toxic, but that’s the least of the problem.
then find out said introduction is 100% on the spot.
[0] http://blogs.sciencemag.org/pipeline/archives/category/thing...