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  1. Chemistry

    How to brew a better espresso, according to science

    To make more consistent and affordable espresso shots, use fewer beans and grind them more coarsely, a new study says.

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  2. Paleontology

    A squid fossil offers a rare record of pterosaur feeding behavior

    150 million years ago, a pterosaur attempted to snatch a squid from the ocean surface and lost a tooth in the process.

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  3. Pain opens the door for dubious stem cell treatments

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  4. Readers comment on penguin sex, math and more

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  5. Health & Medicine

    How one woman became the exception to her family’s Alzheimer’s history

    A single mutation in a woman who evaded Alzheimer’s may point to new ways to treat the disease.