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The Romans are famous for their baths, aqueducts and toilets. But the sanitary innovations might not have done as much to improve health as was once believed.

It took a British doc, a simple recipe for liquid morphine and a lot of re-education.

The topics range from knowing our bodies — exploring mysteries of "lost posture" and how well your ears register audio quality — to stories of our times, such as gay marriage and political paranoia.

In people with hemochromatosis, iron builds up and can overload the heart and other organs. Geneticists looking at 5,000-year-old human remains say the disorder may have had evolutionary advantages.

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.

As the withdrawal of U.S. forces continues in Afghanistan, hot meals are being replaced by MREs. In response, a group of military moms has started a Facebook site called "Breakfast for Bagram," to send breakfast foods to troops overseas.

Everyone has a set of genes that keeps the body on a 24-hour rhythm. As we get older, though, the main clock can malfunction. Researchers say a backup clock may try to compensate.

A Saturday evening debate expected to be unexciting could have new fire after the DNC and Sanders sparred over a data breach where his campaign saw proprietary information from Clinton's campaign.

Most politicians aren't cool. And maybe that's ok.

Deck the halls, stuff the stockings and sharpen your pencils. It's time for a holiday history exam.