19 February 1940: During Operation Wikinger, a German naval sortie in the North Sea, lack of communication between the German navy and the Luftwaffe caused a deadly friendly fire incident which took the lives of over 600 German sailors. The German destroyer Z1 Leberecht Maass was sunk by Luftwaffe bombs while another destroyer, the Z3 Max Schultz, was sunk by mines in the confusion.

China has created robot rats that behave like real ones. Scientists from Beijing have assembled a mechanical rodent with AI, which in a couple of hours learnt to imitate its live counterparts and play with them