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    Literate recruits took the written Alpha test, while illiterate applicants took a visual Beta.

    During World War I, the U.S. Army needed a system that would quickly sort recruits into their ideal roles.

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    photo of a researcher talking into the ear of a Pepper robot

    The Information Processing Aptitude test is notoriously difficult.

    The online evaluation consists of half math-based word problems and half number-sequence completions.

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    The society is open only to people who score in the 98th percentile or higher on a preapproved intelligence test.

    The society is open only to people who score in the 98th percentile or higher on a preapproved intelligence test. To be a Mensa member, hopefuls must demonstrate…

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    Algae bloom in Lake Erie, September 2017

    Algae blooms in lakes and oceans generate pollution that harms people, pets, and the planet.

    Algae blooms are a serious problem for lakes, rivers, streams, and seas around the world. Farmers use fertilizer to grow crops, and fertilizer runoff empties into…

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    Psychologists are still arguing about the best methods to spot intelligence.

    Since the turn of the 20th century, psychologists have tried to pin down what it means to be smart. More than 100 years later, they're still arguing about the best…

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    But the cold would kill you before the smell did.

    Sometimes science simply confirms what we already know to be true. You know what I’m talking about: researchers will find evidence that losing sleep makes you cranky and…

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    last week in tech

    Apple's new recycling bot, Nike's new 3D-printed shoe, and Chrome finally shuts up auto-play videos.

    Be sure to download the latest edition of the Last Week in Tech podcast!

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    memory experts

    Scientists share their favorite stories.

    When one crow sees another dead on the ground, it caws an alarm. Then others—five to six on average, but in rare cases as many as 60—fly in and perch on branches,…

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    a hybrid monkey in a tree

    The hybrid kids are alright.

    In 1994, when Kate Detwiler rode the bus to her research site in Gombe National Park, what she was going to observe wasn’t part of the mainstream scientific discourse.

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    galaxies

    Younger galaxies appear flatter than their more well-rounded elders

    Previous research suggested the 3-D shape of a galaxy may hold important hints about its history. Now astrophysicists find these shapes may reveal clues about the age of…