| 1 | To open the amber, place the sample in liquid nitrogen, where it will freeze and become brittle. | |
| 2 | Flash-freezing, either by pouring liquid nitrogen over a bowl of food or by placing food onto an Anti-Griddle | |
| 3 | The high cost of liquid nitrogen for the cryopreservation of semen often restricts AI use far from cities. | |
| 4 | The U.S. smallpox viruses, which include samples from Britain, Japan and the Netherlands, are stored in liquid nitrogen. | |
| 5 | Even in the event of a catastrophic power failure, the vats will stay cold for five weeks on their own. |
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