<human>:  In the science of cryogenics, how do you freeze a person?
<bot>: You can’t. It’s impossible to freeze a person. In order to freeze a person, you would need to lower the temperature of the entire body to very low temperatures. This is extremely dangerous, and would likely kill the person. The only way to preserve a person’s body is to preserve their brain. In the future, scientists may be able to preserve a person’s brain using a technology called vitrification, but we are still far away from being able to do that.