Would liquid nitrogen put you into a coma? Liquid nitrogen can be used to freeze sperm and eggs, resolve skin abnormalities and more. Chefs and bartenders even use it for food and cocktail recipes.

Nitrogen makes up about 78% of the Earth's atmosphere. Liquid nitrogen is very cold, so it is often used to freeze food. The boiling point of nitrogen is −196 °C, so liquid nitrogen is very ...

Enter cryopreservation. The process freezes biological materials by storing them in tanks of liquid nitrogen. At the zoo, the animal samples include sperm, embryos and, very rarely, eggs.

More than 1 million people visit the Cincinnati Zoo & Botanical Garden each year to see the hippos bob in and out of clear water, hear gibbons howl above the treetops, smell the elephants covered ...