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Medieval plague bacteria strain probably extinct
This flea, X. cheopis, is responsible for transmitting the bacteria strain that causes plague.
August 30th, 2011
05:34 PM ET

Medieval plague bacteria strain probably extinct

Modern  outbreaks – swine flu, bird flu, SARS – have been scary and deadly, but they don't hold a candle to a plague called the Black Death. The disease killed an estimated one-third of Europe's population, perhaps 100 million people.

It's been a while, but scientists are now figuring out what caused the Black Death - at least, the one that swept through Europe from 1347 to 1351. They found evidence of the bacterium Yersinia pestis in the teeth of some of the medieval victims of the plague. Results are published in the Proceedings of the National Academy of Sciences.

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Get Some Sleep: Back-to-school bedtimes
August 30th, 2011
04:20 PM ET

Get Some Sleep: Back-to-school bedtimes

Lisa Shives, M.D., is the founder of Northshore Sleep Medicine in Evanston, Illinois. She blogs regularly on The Chart. Read more from her at Dr. Lisa Shives’ Sleep Better Blog.

It is that time of year again. It is starting to get dark earlier. In some parts of the country, there's  a chill in the air at night. And the kids have to go back to school.

For many families, there are some rough days and maybe even weeks ahead as they help their children transition back to a schedule that requires them to get up earlier than they did in the summer.

School-aged children need between 10 and 12 hours of sleep a night. If kids have been going to bed at 10 or 11 p.m. in the summer, it is unlikely that they can suddenly fall asleep at 8 p.m. the night before school starts back. It is best to gradually readjust the bedtime one to two weeks before school starts so that the kids are going to bed 15 minutes earlier every couple of nights until the desired bedtime is reached.
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August 30th, 2011
10:34 AM ET

How can I control my panic attacks?

Every weekday, a CNNHealth expert doctor answers a viewer question. On Tuesdays, it's Dr. Charles Raison, an associate professor of psychiatry and behavioral sciences at Emory University, and an expert in the mind-body connection for health.

Question asked by Stephanie via e-mail

I've been having a lot of panic attacks, almost every day; sometimes when I'm working, dealing with the kids or just nothing at all. I'll get shortness of breath, chest hurts on both sides or just one side, and a lot of my heart skipping a beat. And it scares me. I'm 29 years old and in good health. How can I control this?
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Get a behind-the-scenes look at the latest stories from CNN Chief Medical Correspondent, Dr. Sanjay Gupta, Senior Medical Correspondent Elizabeth Cohen and the CNN Medical Unit producers. They'll share news and views on health and medical trends - info that will help you take better care of yourself and the people you love.

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