2. Pointy Roofs

Nina and her young Experimenters conduct an experiment on how roof tiles keep houses dry.

3. Piers

Nina and her young Experimenters conduct an experiment to explain why piers stay strong.

4. Nests

Nina and her young Experimenters explain how birds keep their eggs safe and warm.

5. Houses

Nina and her young Experimenters discover how builders make holes in walls for windows.

6. Windmills

Experimenters Aaron and Sylvia visit Nina and discover what makes windmills' sails turn.

7. Beaver Dams

Experimenters Bethan, Corey and Rhianna see what happens when you build a dam in a stream.

8. Skyscrapers

Samuel and Sofia discover why skyscrapers need to be stronger the taller they are.

9. Bridges

Alexander, Billie and Marianna visit Nina and discover what a cantilever is.

10. Demolition

Andreea, Soham and Yusuf visit Nina and discover what happens when gas expands quickly.

11. Floating Houses

Experimenters Poppy and Sugar visit Nina to find out how to build floating houses.

12. Rollercoasters

Experimenters Ben, Eryn and Kanie visit Nina to investigate how rollercoasters work.

13. Arches

Experimenters Dylan and Phoebe visit Nina to find out why people use arches in buildings.

14. Lighthouses

Experimenters Livingstone and Oisin visit Nina to investigate how lighthouses are built.

15. Living Underground

Experimenters Taite and Taruni visit Nina to find out why some animals live underground.

16. Living Underwater

Experimenters Lyla and Sandy find out if we could live in an underwater house.

17. Igloos

Experimenters Ethan and Eva discover what the walls of an igloo are made from.

18. Spiders' Webs

Experimenters Hugo and Ugochi visit Nina to investigate how a spider builds its web.

19. Domes

Experimenters Billy and Katy visit Nina to investigate how domes are built.

20. Amphitheatres

Experimenters Arnav and Ayomide visit Nina to investigate what an amphitheater is.