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Who loves lasers? This fellow built a home built laser that relies on the carbon dioxide from his own breath. Pretty awesome:
“Look Mom; I Lased my Breath” … Seriously, though - by exhaling into my ‘supply’ balloon, I was able to get pretty good results considering! Unlike a ‘proper’ laser mix of CO2, N2, and He; the ‘breath’ trick appears to have a much narrower pressure range over which lasing will occur. But I like it anyway - it doesn’t get much more DIY than this!
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