An example of such misuse is New Age guru Deepak Chopra's "quantum theory" that aging is caused by the mind, expounded in his books Quantum Healing (1989) and Ageless Body, Timeless Mind (1993).[1] In 1998 Chopra was awarded the parody Ig Nobel Prize in the physics category for "his unique interpretation of quantum physics as it applies to life, liberty, and the pursuit of economic happiness".[21]