Robert A. Heinlein

American author and aeronautical engineer (1907–1988)

asteroid

popular adage communicating the idea that it is impossible to get something for nothing

American rocket engineer (1914–1952)

Grok () is a neologism coined by the American writer Robert A. Heinlein in his 1961 science fiction novel Stranger in a Strange Land. The Oxford English Dictionary summarizes the meaning of grok as "to understand intuitively or by empathy, to establish rapport with", and "to empathize or communicate sympathetically (with); also, to experience enjoyment". However, Heinlein's original concept, of a human who comes to Earth in early adulthood after being born on the planet Mars, is far more nuanced.

crater on Mars

American Neopagan religious group

series of stories by Robert A. Heinlein

award established by the Heinlein Society in 2003