This Dutch 30 December video shows what journalist Maarten Keulemans thinks are the best science videos of 2016.
Starting with #6, ants building a living bridge to cross water.
#4 chimpansees mourning one of them which died.
#3 a physics experiment about pressure.
#2 an electric eel jumping.
# 1 dogs having their brains scanned.
Some significant scientific developments of 2016: here.