Science

The mites that live on our faces may help reveal where our ancestors came from. It wouldn't be the first time that creepy crawlies have revealed something more than skin deep about the human past.

Hardy, nutritious and gluten-free, millet has become an "it" grain in recent years. Research reveals our ancestors relied on it: Millet was central to the rise of agriculture and farming communities.

College student Austin Martin has created a website that uses rap lyrics to teach vocabulary to middle and high school students.

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.

The decision means a significant delay in the InSight program, because Earth's and Mars' orbits are aligned in a way that makes a launch possible only every 26 months. Blame a faulty seismometer.

It's hard for anyone to get enough of the sunshine vitamin in the wintry North, and dark-skinned teens may be especially prone to a deficiency, doctors find. A weekly supplement can help.