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    2. PhotoBERJAYA
      CreditAndrew Scrivani for The New York Times

      Trilobites

      How Making Chocolate Is Like Mixing Cement

      Researchers delved into the physics of conching, the stirring process that transforms ground cacao into a meltingly smooth treat.

Trilobites

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  5. PhotoBERJAYA
    CreditJason Milich

    Wasps Passed This Logic Test. Can You?

    The insects frequently found in your backyard appear to be the first invertebrate known to be capable of the skill of transitive inference.

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    There’s Evidence on How to Raise Children, but Are Parents Listening?

    Day-to-day individual choices matter less than we think, but national policies seem to matter a lot.

    By Emily Oster

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    Dr. Leonard Bailey, Who Gave a Baby a Baboon’s Heart, Dies at 76

    The case of Baby Fae, the recipient of Dr. Bailey’s experimental transplant in 1984, generated worldwide headlines — along with criticism, demonstrations and threats.

    By Denise Grady

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    One Thing You Can Do: Drive Smarter

    Also this week, climate report cards for Democratic candidates.

    By Lisa Friedman and Eduardo Garcia

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    Measles Outbreak Now at 880 Cases, With Fastest Growth Still in New York

    Warming weather usually slows transmission of the virus, but it is not clear that this outbreak is fading, experts said.

    By Donald G. McNeil Jr.

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    Tuesday Could Be the Beginning of the End of Philadelphia’s Soda Tax

    A slew of opponents of the tax are running in the city’s election Tuesday and beverage industry has spent more than $600,000 on ads aiming to turn public opinion against it.

    By Andrew Jacobs

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    I Have the Tree. Where’s the Grapefruit?

    Grapefruit trees need light, bees — and a temperature gradient.

    By C. Claiborne Ray

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    Why High-Class People Get Away With Incompetence

    People who came from higher social classes were more likely to have an inflated sense of their skills, a new study found. This overconfidence was interpreted by strangers as competence.

    By Heather Murphy

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    E.P.A. Plans to Get Thousands of Pollution Deaths Off the Books by Changing Its Math

    The E.P.A. plans to change the way air pollution health risks are calculated in a way that would sharply lower estimated deaths from new, looser rules for coal plants.

    By Lisa Friedman

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    Fighting Ebola When Mourners Fight the Responders

    An Ebola outbreak in eastern Congo — the second-largest in history — is escalating in part because locals don’t trust health workers and government officials.

    By Joseph Goldstein and Finbarr O’Reilly

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    What Does It Really Mean to Be 6 Weeks Pregnant?

    So-called ‘heartbeat’ legislation restricting abortion as early as six weeks into pregnancy has started a conversation about when most women actually learn that they’re pregnant.

    By Christina Caron

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