Wow...

Head-on collision of two vortex rings:

http://technology.todaysbigthing.com/2009/08/04

(worksafe)

Firefox Problems

Why in the name of sanity would a tab loading slowly prevent Firefox from switching to another tab? I keep running into this. I'll select a URL in one tab, try to switch to another - already loaded - while it loads, but Firefox won't budge until at least part of the first tab loads. Those are independent operations!