One person famous for her alleged ability to use her brain this way was Nina Kulagina. Kulagina, a Russian housewife born in 1927, caused a sensation in the 1960s and 70s with her alleged mental powers. Kulagina demonstrated her ability in a number of experiments, many of which were filmed. In one experiment, she separated the yolk and the white of an egg dropped into a tank of water. In her most incredible experiment, Kulagina used her mind to slow a frog's heartbeat until it stopped completely.