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Deaths linked to opioids are skyrocketing, and so is the number of Americans abusing the drugs, experts say.

Christina Smolke/Stanford University

Opioids and overdoses: 4 things to know

Deaths linked to opioids are skyrocketing, and so is the number of Americans abusing the drugs, experts say.

China currency flag

CNN

China gets into genetic breakthrough business

The future of regenerative medicine may be in your toilet, according to cutting-edge research in China.

Michael Phelps, 2008 Olympics, 400-meter individual medley

Ezra Shaw/Getty Images

Phelps: 'I don't know if I'm an alcoholic'

Michael Phelps, the most decorated athlete in Olympic history, has a checkered and well-publicized history with alcohol and drug use.

Ann-Margret, 2013

Daniel Zuchnik/Getty Images

Red-hot redheaded celebrity women

Hollywood icon Ann-Margret, who celebrates her 75th birthday Thursday, is just one of our favorite carrot-top women. Check out some more in this slideshow.

Schizophrenia blurb image

iStock

Can this app change schizophrenia treatment?

People with schizophrenia often say the disease is an isolating one. They can struggle to connect with loved ones or to find people who understand what they're dealing with.

Prince with guitar

Kevin Winter/Getty Images

Why don't we know yet what killed Prince?

We might not know what killed pop superstar Prince for weeks or even months. And while forensic science-themed TV shows make it look quick and easy, and the technology has improved, modern death investigations take time.

runners

Einar Hansen/freeimages.com

Girl, 12, accidentally runs half marathon

If the idea of running a half marathon -- 13.1 miles -- makes you want to run and hide, good news. It may not be as hard as it seems.

bathroom sign

CNN

Transgender issues resonate across the US

A flurry of policies affecting transgender people has swept the country in recent weeks, leading to widespread protests, economic losses and a growing debate about equality and privacy.

Most recently, an Alabama city passed a law saying if people use ...

Harvard campus

Joe Raedle / Getty Images

Mumps outbreak sickens 40 people at Harvard

Please stop infecting each other. That's the message Harvard University has for students after a mumps outbreak left 40 people sick over the past two months.

Beyonce Lemonade 1

HBO via CNN

Beyonce through the years

With Beyonce launching her "Formation" concert tour in Miami Wednesday night, just days after dropping the "visual album" known as "Lemonade," take a look back at her career so far.

salmon fish fillets on grill

suzie long/SXC

Mediterranean diet linked to lower risk of heart attack

The list of Mediterranean diet benefits is getting even longer. A new study found that a diet high in fruits, vegetables, fish and unrefined foods is linked to a lower risk of heart attack and stroke in people who have heart disease.

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