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For such a commonplace bodily function, the sneeze has messed with our minds (and noses) for centuries. It will kill us, it won't kill us. We'll have bad luck, we'll have good luck. Watch out for Satan, he's wily and knows how to get into your nasal membranes. Did you have too much to eat? Are you sad? Do you have a weak heart?

To a mathematician, it's a violent explosion that shoots out missiles of hot, wet air, slamming a turbulent cloud of moisture into anybody or anything that crosses its path.

To the rest of us, it's a sneeze.

They call it the octobot.

The squishy eight-legged robot described in the journal Nature is made entirely out of soft, flexible materials, runs on hydrogen peroxide, and looks like a 2-centimeter-tall baby octopus.

A major study about the best way to treat early-stage breast cancer reveals that "precision medicine" doesn't provide unambiguous answers about how to choose the best therapy.

"Precision doesn't mean certainty," says David Hunter, a professor of cancer prevention at Harvard's T.H. Chan School of Public Health.

That point is illustrated in a large study published Wednesday in the New England Journal of Medicine, involving decisions about chemotherapy.

Oil #5: Imagine A World Without Oil

13 hours ago

On today's show, we follow the Planet Money oil to the end of the line.

And we ask: What would the world be like if fossil fuels did not exist? What if you dug down in the ground and there was nothing but dirt and rock.

Oil, coal and natural gas are this incredible store of energy, just sitting there in the ground waiting for us to dig them up. Amazing boon to humanity! But also: Climate change!

Would a world without oil be better? Worse? Or just different?

This is the last of five episodes about buying oil.

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