Crying boy pictured being raised with chimp in sick 'experiment' with tragic ending
Chilling photographs show inside a disturbing experiment involving a litlte boy and his "sister" chimp who were spun on ...
Boy, 5, raised with chimp in sick study 'started grunting and biting' before tragic end
It is almost 93 years since the experiment was abruptly terminated in the early part of 1932 - and below we take a closer ...