Flu Do You Think You Are?

In 1918, Spanish flu wiped out more people than World War 1. Now, a century on, we're asking why this pandemic packed such a punch, where flu came from in the first place, and how flu vaccines are made. Plus, fossilised fats from the world's first animals, a look at the IgNobel prizes, genes linked to hypertension, and the computer game that gets kids into engineering...