2015 was the first year 90 percent of Americans had health insurance. Thanks, Obama.

New federal data shows a dramatic decline in the uninsured rate.

Middle schoolers asked me how to stop using fossil fuels. Here's my response.

Sorry your parents' generation screwed up. Here's how you can do better.

3 states are down to one Obamacare insurer. What if they fall to zero?

"This is a tough situation because there isn’t a good contingency plan right now."

The first US penis transplant is part of a new wave of transplants to improve, but not save, lives

So far, the operation has been successful — but it's only the third in the world and carries a great deal of risk.

The real value of urban farming. (Hint: It's not always the food.)

A closer look at how community gardens and urban farms are transforming American cities.

When to cook with fancy salt — and when cheap salt will do

A quick guide to kosher, table, and sea salt.

The awesome beauty of the Milky Way, in one enormous image

If this doesn't make you feel small, feeble, and full of awe — nothing will.

The case of the $629 Band-Aid — and what it reveals about American health care

A quick visit to the emergency room can get expensive.

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Researchers just released profile data on 70,000 OkCupid users without permission

This is a huge breach of social science ethics.

The US is badly underinvesting in electricity infrastructure

And we're going to regret it.

Suicide rates don't go up in the winter. They spike in the spring.

For the past 15 years in the US, suicide rates have been highest in late spring and summer, although there is evidence this might be changing.

Science hype is too common. Stem cell researchers say it needs to stop.

The International Society for Stem Cell Research just issued guidelines on how researchers can better communicate their work.

ACHOO syndrome: Why some people sneeze every time they see the sun

The photic sneeze reflex, explained.

Here's what 9,000 years of breeding has done to corn, peaches, and other crops

Corn, watermelon, and peaches were unrecognizable 8,000 years ago.

Abortion rates in North America and Europe are now at 30-year lows

Better birth control has contributed to plummeting abortion rates among developed countries.

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