SAN FRANCISCO (KGO) -- We've all heard the devastating stories about children dying after they've been left inside a parked car on a hot day.
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According to the National Highway Traffic Safety Administration (NHTSA), 700 children left in cars died from heatstroke from 1998 to 2016. And of those deaths, 376 were children "forgotten" by a caregiver.
But, researchers at Stanford say that "even on a relatively cool day, the temperature inside a parked car can quickly spike to life-threatening levels if the sun is out."
Here's a look at just how hot it can get:
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