Why do Pigeons nod their Heads?

Why do Pigeons nod their heads? How does food become body fat? What can you do with a ramjet? We take on these questions as well as discover how megapixels are formed, whether bees go into their hives at night and why we use CO2 in fizzy drinks. Plus, we sniff out why cows produce methane! Like this podcast? Please help us by supporting the Naked Scientists