Answer: Space Travel, Surgery and Magnetic Levitation
Notes: Cryogenics involves the study and application of very low temperatures. Its usage spans across sectors, from space travel to medical science. In space travel, cryogens like liquid hydrogen and oxygen help to propel rockets. In surgeries, a technique called cryosurgery uses such temperatures to constrict blood vessels, hence controlling blood loss. In the technologically advanced field of magnetic resonance imaging (MRI), cryogens like liquid helium are used to cool the coils in order to generate strong magnetic fields. This field is key in detecting proton relaxation, providing the much-needed imagery for diagnostics.
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