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Having trouble getting pregnant? Scientists have discovered a new reason behind unexplained infertility. After sex, female eggs send out chemical signals for sperm to approach or stay away. Researchers found that female eggs show no preference for their partner’s sperm compared to a random stranger.

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A normal pregnancy usually lasts around 40 weeks, but births that occur before 37 weeks are defined as being premature. Premature births are associated with a wide range of problems in infant children, and generally, the shorter the term of a pregnancy, the greater the health problems there will be for the infant. In…