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What happens to lost body fat when we lose weight? Our fat is stored as triglycerides. When we need it for energy, enzymes in the blood break it down into fatty acid chains and glycerol. The fatty acids are absorbed by cells and broken down into even smaller molecules and ‘fed’ to our mitochondria (the ‘power plants’ of our cells). The ultimate waste products of this this complex sequence are just CO2 and H2O, which we breathe out. So when you exercise, you are turning fat into puffing and panting. Do insects sleep? Yes. They don’t have eyelids, so they don’t close their eyes like we do. Cockroaches, however, will fold down their antennae when they sleep, which has the similar purpose of protecting delicate sensory organs. When asleep, insects aren’t just resting – sleeping praying mantises will droop downwards and sleeping bees are harder to startle than those that are having a rest. Are public Wi-Fi networks safe? No Wi-Fi network is completely safe if you have the wrong settings on