| Gas (143) |  |
| Liquid gas (3) | |
| Natural gas (72) | |
| Gas (143) | |
| Liquid gas (3) | |
| Natural gas (72) | |
A key part of this grand ambition lies in the lines of test tubes frozen in liquid nitrogen in a Californian zoo.
The technology uses liquid nitrogen rather than liquid helium as a coolant, which lets the system run somewhere between 63 and 77 Kelvin (minus-321 to minus-346 Fahrenheit, the zone in
Seize'em and freeze'em Preserving samples in liquid nitrogen. Credit: USDA) Mulligan's column reminded me of a variation on this cloning idea years from almost 20 years ago.
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