This week, we're taking on your science brainteasers! We find out why toothpaste ruins other flavours, whether humans have a mating season and why food goes in multicoloured, but comes out brown... Plus, fighting Fido's fleas with fungus, stressed men take more risks, and predicting if hepatitis B will lead to liver cancer. In Kitchen Science, we make a fruity fireball with orange peel. Like this podcast? Please help us by supporting the Naked Scientists