Ask a Physicist: Why can't we get down to absolute zero?

Greetings, physics junkies. This week, I decided to take a break from particle physics, cosmology and relativity, and do some good old-fashioned thermal physics (though cosmology still manages to sneak in there): Why can’t we get down to Absolute Zero? There’s a fair amount about cold temperature records, lame superweapons, and the ultimate heat death of the universe — something for everyone.

If you’re visiting from io9, take a look around, especially on the “physics” tag. And, as always, feel free to send me questions.

-Dave

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