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Two iconic notebooks, which include Darwin's 1837 <em>Tree of Life</em> sketch, were returned to the Cambridge University Library last month.

2 missing Charles Darwin notebooks are mysteriously returned more than 20 years later

The iconic notebooks, which include Darwin's 1837 Tree of Life sketch, were returned to the Cambridge University Library last month.

'City of Orange' is a post-apocalyptic tale starting with memory loss

The double threat of climate change and the global pandemic has made post-apocalyptic fiction an undeniably thriving and popular genre. Author David Yoon has one of the latest entrants.

A colorized electron microscope image from the National Institute of Allergy and Infectious Diseases shows a single human immunodeficiency virus budding from a human immune cell, which the virus had infected.

Discovery of HIV variant shows virus can evolve to be more severe — and contagious

Findings from a new study help answer questions about why some people get more severe and transmissible HIV than others — and serve as a reminder that viruses don't always weaken over time.

Travelers will need to continue to wear protective face masks at airports, on planes, trains, buses and transit hubs, as the CDC is extending the mask requirement for travelers.

CDC extends transportation mask mandate until May 3

The Biden administration will continue to require travelers to wear masks on planes and other forms of public transport.

President Barack Obama delivers a televised statement that Osama bin Laden was killed in 2011. President Donald Trump makes a statement announcing the death of ISIS leader Abu Bakr al-Baghdadi in 2019. President Biden announces on Monday that a U.S. drone strike in Afghanistan killed al-Qaida leader Ayman al-Zawahiri.

How 3 presidents announced the deaths of terrorist leaders and what it says about them

The way Barack Obama, Donald Trump and Joe Biden announced the deaths of terrorist chiefs revealed much about their own leadership.

Inventory shelves are stocked with a variety of medications at Pure Care Pharmacy in Carmel Valley, April 9, 2020.

Pharmacists at increased risk of suicide, UC San Diego study finds

Pharmacists are at greater risk than the general population to commit suicide, a fact that may be exacerbated by the COVID-19 pandemic, a UC San Diego study released Friday which focuses on mental health and burnout within health care professions.

People in Los Angeles walk in a silent protest march on April 9, 2012, to demand justice for the killing of Trayvon Martin.

Trayvon Martin's killing 10 years ago changed the tenor of democracy

The Black teen's killing on Feb. 26, 2012, helped spark Black Lives Matter. Though the movement has seemingly yielded some cultural change, it comes at a time when hope for legal change is tenuous.

Big risks and adventurous friends: How composer Julia Wolfe became a renegade

The Pulitzer-winning, MacArthur "genius" co-founder of Bang on a Can looks for the grit in music, whether she's writing a string quartet or one of her history-based oratorios.

A woman cools off at a fountain at the Sforza Castle in Milan, Italy, on July 13. You can do a lot to look out for those who are at higher risk of heat-related illness.

How to protect the people you care about from extreme heat

Heat waves can take a toll on our health, and some people are especially vulnerable. But you can do a lot to look out for those who are at higher risk of heat-related illness.

Masks have been a common sight during the pandemic.

This photo of a professor wearing a mask went viral. So did his response to critics

Professor Jon Levy went viral for wearing a mask during a Zoom call alone in his office. He has some thoughts about why.

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