Neanderthals died out long ago, but their genes live on in us. Scientists studying human chromosomes say they've discovered a surprising amount of Neanderthal DNA in our genes. And these aren't just random fragments; they help shape what we look like today, including our hair and skin.
These genes crept into our DNA tens of thousands of years ago, during occasional sexual encounters between Neanderthals and human ancestors who lived in Europe at the time. They show up today in their descendants, people of European and Asian descent.
On Jan. 9, people in and around Charleston, W.Va., began showing up at hospitals: They had nausea, eye infections and some were vomiting. It was later discovered that around 10,000 gallons of toxic chemicals had leaked into the Elk River, just upstream from a water treatment plant that serves 300,000 people. Citizens were told not to drink or bathe in the water, and while some people are now using water from their taps, many still don't trust it or the information coming from public officials.
Back in 1958, a young biologist at Cornell University made a stunning discovery.
He took a single cell from a carrot and then mixed it with some coconut milk. Days went by and the cell started dividing. Little roots formed. Stems started growing. Eventually, a whole new carrot plant rose up from the single cell.
Imagine if you could perform a similar feat with animal cells, even human cells.
Scientists have reconstructed the genetic code of a strain of bacteria that caused one of the most deadly pandemics in history nearly 1,500 years ago.
They did it by finding the skeletons of people killed by the plague and extracting DNA from traces of blood inside their teeth.
This plague struck in the year 541, under the reign of the Roman emperor Justinian, so it's usually called the Justinian plague. The emperor actually got sick himself but recovered. He was one of the lucky ones.