Vaquitas still exist, but barely: sea 'panda' survey

The vaquita, a small porpoise on the verge of extinction, is still hanging in there, said scientists Wednesday who had spotted about a dozen specimens of Mexico's "panda of the sea" on an expedition in May.

Sperm switch swimming patterns to locate egg

A new study reveals how sperm change their swimming patterns to navigate to the egg, shifting from a symmetrical motion that moves the sperm in a straight path to an asymmetrical one that promotes more circular swimming.

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