Adam Cole

Your body needs oxygen to function — and that was true even before you were born. As you grew inside your mother's womb, even before you had working lungs, your cells were crying out for oxygen. And your mother kindly answered that call. Oxygen and nutrients from her blood made their way down your umbilical cord, through your belly button, and fueled your body.

Editor's note: As the Oscars approach, we're celebrating America's favorite movie snack by bringing back this story, first published in 2014.

Love is complicated, scientifically speaking. There's no single, specific "love chemical" that surges through our bodies when we see our beloved, and we can't point to a specific corner of the brain where love resides.

Tuesday is an anniversary worth noting: On Jan. 30, 1868, Charles Darwin published a follow-up to his masterpiece On The Origin Of Species. This less-popular tome (897 pages!) contained a vexing puzzle:

Why do pets and livestock tend to have "drooping ears?"

Updated at 5:15 p.m. ET Sept. 14

The Cassini spacecraft's final moments are a few hours away. Early Friday morning, it will slam itself into Saturn's atmosphere.

In July of 1878, Vassar professor Maria Mitchell led a team of astronomers to the new state of Colorado to observe a total solar eclipse. In a field outside of Denver, they watched as the sun went dark and a feathery fan of bright tendrils — the solar corona — faded into view.

What if you could go back in time and follow your food from the farm to your plate? What if you could see each step of your meal's journey — every ingredient that went into its creation, and every footprint it left behind?

If you just celebrated Easter, you might have some stale marshmallow Peeps lying around the house. And if you want to avoid eating those Peeps, they are the perfect material for a science experiment you can do in your own kitchen.

With the help of a ruler and a microwave, you can use leftover Peeps to calculate one of the constants of the universe — the speed of light.

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NPR's YouTube channel, Skunk Bear, answers your science questions. This week, we picked one in honor of David Bowie.

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