/r/askscience
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Why is it that during winter it's not uncommon to have days with abnormally high temperature and summer-like weather, but in the summer it never drops to winter-like weather for a day?
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If we could travel at 99.9% the speed of light, it would take 4 years to get to Alpha Centauri. Would the people on the spaceship feel like they were stuck on board for 4 years or would it feel shorter for them?
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What is the point of using screws with a Phillips head, flathead, allen, hex, etc. instead of just having one universal screw type?
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