Maggie Philbin looks at the problems the humanitarian community faces when tackling a disaster.

The team look at the many measures engineers are taking to ensure Britain's ageing rail system stays on track.

Did global warming play a part in the recent floods, or is it the extreme end of the natural cycle? Maggie Philbin investigates the threat of storm surge.

The team look at flu and its different strains. Jem Stansfield explains the disease on a cellular level, while Liz Bonnin witnesses the manufacture of vaccines.

The team investigate the ill effects of old age. Maggie Philbin looks at how our muscles change as we get older, and Liz Bonnin explains how bones are made.

Liz Bonnin sees how big data monitors Rolls Royce jet engines, and Jem Stansfield creates a low-tech computer system.

Liz Bonnin explains how cells turn cancerous by blowing high-tech bubbles, and Jem Stansfield builds a radiotherapy gun.

Jem Stansfield, Liz Bonnin and Maggie Philbin investigate how close Britain might get to running out of electricity.