Killer whales are offering humans prey and waiting for a reply. Why? gopalkumarthakur@gmail.com 1 year ago A new study has found that killer whales may be exploring human behaviour by offering them whole prey and waiting for them to respond Related posts: Scientists turn E. coli bacteria into a mercury sensor A bistable gene in a deadly bacterium offers a clue to beating it What’s the issue with the way Africa is shown on maps? | Explained Absurd units of measurement