6.20 Maths: Conics
How circles and ellipses, hyperbolas and parabolas can all be made by slicing through a cone.
6.45 The Emergence of Greek Mathematics
Euclid's Elements was written more than 2,000 years ago - why has it been such a revered maths textbook ever since?
7.10 Black Girls in Search of Learning
Asian girls in Leicester talk about their experience of school.
7.35 Magnetic Fields in Space: the Aurora Borealis
The Northern Lights are a polar phenomenon, but are closely linked to the sun - how can this be?