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The need for shut-eye is universal. Justin Lewis/Stone via Getty Images

How much sleep do you really need?

Getting a good night's sleep on a regular basis can help you do well in school or at work. It might even make you better-looking.
A visualization of daily life around Angkor Wat in the late 12th century. Tom Chandler, Mike Yeates, Chandara Ung and Brent McKee, Monash University, 2021

A metropolis arose in medieval Cambodia – new research shows how many people lived in the Angkor Empire over time

Combining archaeological evidence, aerial scans and machine learning algorithms, researchers modeled how this medieval city grew over time.
Fossils of Shuvuuia deserti depict a small predatory creature with exceptional night vision and hearing. Mick Ellison/American Natural History Museum

Nocturnal dinosaurs: Night vision and superb hearing in a small theropod suggest it was a moonlight predator

By looking at the eye bones and ear canals of extinct dinosaurs, researchers show that a small ancient predator likely hunted at night and had senses as good as a modern barn owl.
Methane is the world’s second most abundant greenhouse gas. It doesn’t stay in the atmosphere as long as CO2, but it’s many times more potent. Photo by Don Bartletti/Los Angeles Times via Getty Image

Reducing methane is crucial for protecting climate and health, and it can pay for itself – so why aren’t more companies doing it?

The lead author of a new UN report on methane explains the findings and how oil and gas companies could be making money and saving the climate at the same time.
Mary Washington helped her son develop into the leader he became. While her son was the subject of several portrait artists, there is no record that Mary ever was. Stock Montage/Getty Images

Mary Ball Washington, George’s single mother, often gets overlooked – but she’s well worth saluting

Mary Washington raised George and his four siblings mainly alone, imbuing in George many of his best traits. Historians have focused instead on George's complaints about her.
A condolence message and candles for the victims of a stampede during a Jewish ultra-Orthodox mass pilgrimage to Mount Meron, projected on a wall of Jerusalem’s Old City. Ilia Yefimovich/picture alliance via Getty Images

Lag BaOmer pilgrimage brings Orthodox Jews closer to eternity – I experienced this spiritual bonding in years before the tragedy

The Lag BaOmer pilgrimage, in which 45 people died recently, takes place each year to what is believed to be the gravesite of the second-century Talmudic sage Rabbi Shimon Bar Yochai.
Astronaut Tracy Caldwell Dyson on the International Space Station with a view many more are likely to see soon. NASA/Tracy Caldwell Dyson/WIkimediaCommons

Space tourism is here – 20 years after the first stellar tourist, Jeff Bezos’ Blue Origin plans to send civilians to space

The first space tourist left Earth 20 years ago aboard a Russian rocket. Now, private companies like Jeff Bezos' Blue Origin are offering trips to the stars for those who can pay.
The US has agreed to ‘free the vaccine’, but will it work? Allison Bailey / Alamy Stock Photo

US-backed vaccine patent waiver: pros and cons explained

It's not clear whether the TRIPS agreement is what's getting in the way of vaccine supply, and waiving intellectual property rights may stifle future innovation.

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