Mental Radio: Does it work, and how? (1930) is a book by American author Upton Sinclair, self-published initially. The book documents Sinclair's tests of his second wife, Mary Craig Sinclair's psychic abilities during a period of depression and interest in the occult. Mary attempted to replicate 290 drawings made by her brother, with Sinclair claiming she successfully duplicated 65, had 155 "partial successes", and 70 failures. The experiments lacked a controlled scientific environment.