‘Do cats and dogs understand humans when they make miaowing or barking noises?” ask Mila (11) and Alex (8). There’s been a lot of research about communication between people and domestic ...

Planarian flatworms regenerate their heads and tails after amputation. It turns out that they use Wnt–β-catenin signalling to determine where the head and the tail should form. Figure 1: Wnt ...