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Sex in space? Sperm struggles to navigate during weightless sex

  Astronauts may struggle to reproduce in outer space, study suggests — what does that mean for the future of space colonization? A new study found that microgravity simulated on Earth hindered sperm cell movement, egg fertilization and embryo development ‪—‬ findings that have serious implications for the future of space colonization.

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Countries Where Tipping Is Considered Rude

-1 Traveling abroad can be full of surprises, especially regarding local customs. One of the biggest culture shocks for many tourists is discovering that tipping—a common practice in countries like the United States—can offend locals in other parts of the world. In these 8 countries, your well-intentioned extra cash might raise eyebrows or even insult your server. Each place has ...

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