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Potential answers for the unexpectedly high levels of silica all involve water. The space agency also says it found "a mineral named tridymite, rare on Earth and never seen before on Mars."

"Average daily attendance" has long been a trusted measure, but the number conceals an important metric in identifying kids at risk of failing or dropping out: chronic absence.

The Treasury Department has launched a new type of retirement account that allows people to save without taking risks or paying fees. The myRA program is designed to encourage workers to start saving.

As you might have guessed, the answer is not Tanzania. So the holiday season is a good time to reflect on ... electricity.

Average gasoline prices fell below $2 a gallon this week. That means U.S. consumers saved more than $100 billion this year at the gas pump, or about $550 per licensed driver. At the same time, falling natural gas prices — combined with warm temperatures in much of the country — will mean big savings on heating bills. But consumers don't seem to be spending more yet. Why? In Vermont, at least, people are worried about warm days hurting tourism.

Some are sad; some are happy. All of them are worth a few minutes of your time.

Floodwaters continue to rise in the Midwest where thousands of people have been evacuated from their homes. Nine states have declared a state of emergency.

Republican presidential candidate Ted Cruz is barnstorming across Iowa, where his appeal to evangelical voters is making him a threat to GOP front-runner Donald Trump in the first caucus state.

Yes, according to an economist who wrote a blog post that went viral in 2013. Now he has expanded the basics in a book, The Index Card.

An investigation into the killing in Britain of Alexander Litvinenko puts the blame on the Russian government. The British report says President Vladimir Putin likely approved the assassination.