XYY Syndrome. XYY has been found in people like Charles Manson.

Arid. The word "arid" indicates an extremely dry climate.

Gemini. The Clown Face Nebula is also in the Gemini constellation.

Rotorcraft. A rotorcraft uses lift created by rotor blades.

Nikola Tesla. Tesla was an inventor, mechanical engineer and electrical engineer.

England. A CAT scan is a series of x-rays that are assembled by a computer to create detailed images.