One of Kulagina's most celebrated experiments took place in a Leningrad laboratory on 10 March 1970. Having initially studied the ability to move inanimate objects, scientists were curious to see if Nina's abilities extended to cells, tissues, and organs. Sergeyev was one of many scientists present when Nina attempted to use her energy to stop the beating of a frog's heart floating in solution. He said that she focused intently on the heart and apparently made it beat faster, then slower, and using extreme intent of thought, stopped it