"We sometimes freeze the specimen with liquid nitrogen, which is extremely cold, you know. This is another technique we use now - but the specimens are not alive"

Lennart Nilsson is referring to a method utilized in clinical research study, which includes freezing specimens with liquid nitrogen. Liquid nitrogen is a cryogenic liquid, implying it is incredibly cold, and is utilized to freeze specimens in order to maintain them for further study. This method is utilized in place of traditional methods of maintaining specimens, such as maintaining them in formaldehyde, as it does not harm the specimen in the exact same method. Nevertheless, this strategy is only used on specimens that are not alive, as freezing a living organism would trigger it to die. This method is utilized in a range of scientific fields, such as biology, medication, and biochemistry, and is a crucial tool for scientists to study specimens in detail.