The Capgras Delusion is a rare disorder in which a person holds the delusional belief that an acquaintance—usually a spouse or other close family member—has been replaced by an identical impostor. Found in patients diagnosed with schizophrenia, dementia, or those suffering from a brain injury, the disorder is named after Joseph Capgras, the French psychiatrist who first described it in 1923.
A molecular machine is a minute mechanism consisting of molecular components that perform mechanical-like movements in response to specific stimuli. Chemists have synthesized a number of simple molecular machines, including molecular propellers and molecular motors, the latter of which are powered by light or reactions with other molecules and are capable of unidirectional rotation.
Far more complex biological versions of these artificial nanomachines are found in living cells. What do they do?