Synopsis
The crew seized an unexpected opportunity, when a perfect set of technical and animal circumstances converged, to film this behaviour for the first time. The diversion afforded by the tuna attack allows the unwieldy whale shark time to turn on the baitfish sheltering under its bulk. Interesting to the observers was that it didn't just ram feed but actively gulped deliberate great mouthfuls.

Electrolysis of aluminium | Inside the Factory
Cherry travels to Scotland to visit the UK's last remaining factory that produces aluminium via smelting and electrolysis.

The End of God?: A Horizon Guide to Science and Religion
Thomas Dixon delves into the BBC's archive to explore the troubled relationship between religion and science, from the creationists of America to the physicists of the Large Hadron Collider.