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  1. Humans

    50 years ago, scientists debated when humans first set foot in North America

    In 1973, archaeologists debated when people first arrived in the Americas. Mounting evidence suggests its much earlier than they thought.

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  2. Animals

    A newfound ‘croakless’ frog may communicate via touch

    A newly discovered frog species in Tanzania joins a rare group of frogs that don’t croak or ribbit.

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  3. Physics

    Water is weird. A new type of ice could help us understand why

    A newfound type of amorphous ice with a density close to liquid water could help scientists make sense of water’s quirks.

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  4. Animals

    Are your cats having fun or fighting? Here are some ways to tell

    Certain behaviors indicate if your cats’ interaction is friendly, aggressive or something in between, a new study finds.