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  1. Animals

    50 years ago, scientists warned of a sparrow’s extinction

    Only 17 dusky seaside sparrows remained in 1968. Today, there are none.

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  2. Animals

    Green blood in lizards probably evolved four times

    Pigment buildups that would cause jaundice in people are normal for some New Guinea skinks.

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  3. Particle Physics

    The inside of a proton endures more pressure than anything else we’ve seen

    For the first time, scientists used experimental data to estimate the pressure inside a proton.

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  4. Cosmology

    These stars may have been born only 250 million years after the Big Bang

    Scientists find evidence that stars were forming just 250 million years after the universe was born.