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Scientists working in Ethiopia say they've found the earliest known fossil on the ancestral line that led to humans. It's part of a lower jaw with several teeth, and it's about 2.8 million years old. Anthropologists say the fossil fills an important gap in the record of human evolution.

Melissa and her husband started trying to have a baby right after they got married. But nothing was happening. So they went to an infertility clinic and tried round after round of everything the doctors had to offer. But nothing worked.

"They basically told me, 'You know, you have no chance of getting pregnant,' " says Melissa, who asked to be identified only by her first name to protect her privacy.

But Melissa, 30, who lives in Ontario, Canada, didn't give up. She switched clinics and kept trying. She got pregnant once, but that ended in a miscarriage.

With yet another do-or-die test of Obamacare before the U.S. Supreme Court on Wednesday, the justices were sharply divided.

By the end of the argument, it was clear that the outcome will be determined by Chief Justice John Roberts and Justice Anthony Kennedy. The chief justice said almost nothing during the argument, and Kennedy sent mixed signals, seeming to give a slight edge to the administration's interpretation of the law.

Judging by the comments from the remaining justices, the challengers would need the votes of both Roberts and Kennedy to win.

Copyright 2015 NPR. To see more, visit http://www.npr.org/.

Transcript

ROBERT SIEGEL, HOST:

Moles get a bad rap. They dig tunnels destroying gardens and lawns.

MELISSA BLOCK, HOST:

They're not particularly cute or cuddly - I mean, come on, there are games where the goal is to hit plastic moles on the head.

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