Oxygen is not toxic, just setting you on fire very very slowly.
Madness string 2446
In my experience, Vimes, you can argue with anything.
In 2009, researchers found a cluster of galaxies moving at an extraordinary speed towards a small patch of sky between the constellations of Centaurus and Vela. Some unknown force is tearing away chunks of the galaxy, and astronomers still have no clue what exactly is causing it. It's been named 'Dark Flow.'