TFT was developed by an American psychologist by the name Roger Callahan nearly 30 years ago.
Go ne go dulwe letsholo le le neng le laetswe ke American Museum of Natural History la go sekaseka naga nngwe ya Arctic e mmatlisisi Robert E. Peary a neng a begile gore o e bone dingwaga tse di ka nnang supa pelenyana ga foo, ka 1906.