The Color of Dog Poop, and 9 Other Things That Changed Without You Noticing

No matter your age, you’ve seen a lot of technological changes in your lifetime—not to mention changes in the natural world, like climate change. But sometimes things change without us realizing. Here are 10 things that used to be very different than they are today—and you probably never noticed.

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There’s New Hope for an HIV Vaccine

A trial vaccine has succeeded in generating low levels of antibodies needed to target HIV. It’s a first but much-needed step toward preventi...