20/52 Hugo learns that not all advice is good when he climbs a mountain without a jacket on.
4/20 Andy travels back in time 149 million years, to the time of the ammonites.
8/20 Nina investigates how we build skyscrapers so high.
3/20 Andy travels back in time 106 million years, to the time of leaellynasaura.
7/20 With the help of Belle, her hearing neuron, Nina investigates why beavers build dams.
20/20 Andy travels back 145 million years to the time of allosaurus - a meat-eating dinosaur.
Experimenters Amna, Katie and Rachael meet a long jumper.
9/26 Gladdy becomes a gorge-wide recording star with her Tum Tum Tap Tap counting song.
6/25 Tappi Tony shares his memories of aeroplanes with his step-grandchildren Amy and Tommy.
19/20 Andy travels back 65 million years to the time of Tyrannosaurus rex.