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High school students with heavy academic course loads often find the demands of homework colliding with the need for adequate sleep.

It looks like a bright new car wash, but it's a battery swapping station for electric cars in Israel. When a vehicle pulls up, it is slowly pulled through a conveyor. The spent battery is taken out and replaced with one that is fully charged. The entire process takes less than five minutes.

Fighting health care fraud in the U.S. can seem like an endless game of Whack-a-Mole. When government fraud squads crack down on one scheme, another pops up close by.

But the fraud squads that look for scams in the federal Medicare and Medicaid programs have some new weapons: tools and funding provided by the Affordable Care Act.

Medicare and Medicaid pay out some $750 billion each year to more than 1.5 million doctors, hospitals and medical suppliers. By many estimates, about $65 billion a year is lost to fraud.

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Changes in the health insurance industry are at the top of NPR's business news.

The giant insurance company Aetna plans to get a little bigger. It's buying Coventry Health Care for more than $5.5 billion. Now, if you want to know why, consider the changing landscape in which Aetna does business. Medicaid is expanding under President Obama's health care law, Medicare is expanding as Americans grow older, and those government-run plans include many opportunities for private insurance companies.

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STEVE INSKEEP, HOST: