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In this issue, discover the health trackers that can monitor your brain waves, measure blood sugar and even check your balance. Also: Must-have Xmas toys of the 90s, why we only have hair in certain places, have we found life on Mars?, why woolly mammoths ruled the ice age, how wigwams were built, and much more.

For more science and technology articles, pick up the latest copy of How It Works from all good retailers or from our website now. If you have a tablet or smartphone, you can also download the digital version onto your iOS or Android device. To make sure you never miss an issue of How It Works magazine, subscribe today!