Is the earth unique in having them?
We put this to our dinosaur expert from the University of Cambridge, Jason Head.
Geologist, Owen Weller, even brought in the oldest rock in the world.
Did dinosaurs live in herds, or on their own?
Are all mountains pointed in shape?
Was this planet ever a 'water world'?
Is it friction, or something else at work?
How do we find water sources hidden deep underground?
We put our panel through their paces with a summer-themed quiz!
At what altitude above the Earth is zero gravity experienced?
What's so special about the size of the Earth that makes life more likely?
Why don't compasses point to East or West?
...and where does the sky end?
Could the testing of nuclear bombs lead to earthquakes?