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Observations
Which sperm will win the race to the egg: the green one or the red one?

Once they're inside the female reproductive organs, sperm pull out all the stops to outrace their rivals to the egg—especially if the opponent comes from another male. The process that determines which sperm wins, called "postcopulatory sexual selection," has been difficult to tease out, until now.
Observations
Transcription factors boost genetic differences to make individuals unique
Observations
Researchers create metal with a memory
Reuters
EPA to begin study on shale gas drilling
News
Small Dogs Prove Susceptible to Flea Poison
Warning that the powerful poisons can endanger dogs and cats, the U.S. Environmental Protection Agency will require new instructions and labeling for flea products

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