[Right Wing Professor]

weapons enrichment centrifuges have a certain malicious look to them

I was just thinking, Armageddon can look so darn pretty sometimes.

[TomB]

Here's a question that escapes me. At the start of the Manhattan Project they were looking at three ways of enriching Uranium; centrifuge, gas diffusion, and one other. I can't recall the third method. Anyone remember? And are any of the other enrichment methods still viable?