Autogyro – also known as gyroplane, gyrocopter, or rotaplane, is a type of rotorcraft which uses an unpowered rotor in autorotation to develop lift, and an engine-powered propeller, similar to that of a fixed-wing aircraft, to provide thrust.
Toast – According to various apocryphal stories, the custom of touching glasses evolved from concerns about poisoning. By one account, clinking glasses together would cause each drink to spill over into the others’ – An extension of the fact shared in the latest episode of The Big Bang Theory
Gold only has one stable isotope and no other isotope of gold has a half-life of longer than an hour – Which is one of reasons why gold is considered as one of the best measures of money – S04E17: The Toast Derivation
