It is fat bear week, and if you have not seen this before, you have been living in a cave. it is the time of year when alaskan bears bulk up for winter hibernation. so, in nature terms, it's a bit like the trolley dash at the supermarket. you run round frantically, grabbing whatever you can — roots, berries, squirrels, fish! this time of year, an alaskan bear, very good fishermen, might eat something like 250 kilos of fresh salmon. and every year, alaska's katmai national park sticks these bears on social media so we can vote on who is the fattest of them all. this year, the competition is s...