U.S. President Joe Biden, with presidential climate envoy John Kerry, opened the Leaders Summit on Climate on April 22, 2021, by announcing new U.S. targets.
AP Photo/Evan Vucci
Police arrest a protester at a Moscow rally in support of Russian dissident Alexei Navalny, who fell ill while in prison and is now hospitalized.
Alexander Demianchuk\TASS via Getty Images
Darnella Frazier is third from right, recording the murder of George Floyd by police officer Derek Chauvin on May 25, 2020.
Minneapolis Police Department via AP
Medical workers hold signs during a rally in Central Park in New York City by White Coats for Black Lives after the death of George Floyd on May 25, 2020.
Maria Khrenova/TASS via Getty Images
Children play in Las Flores village, Comitancillo, Guatemala, home of a 22-year-old migrant murdered in January 2021 on his journey through Mexico.
Johan Ordonez/AFP via Getty Images
Medical workers hold signs during a rally in Central Park in New York City by White Coats for Black Lives after the death of George Floyd on May 25, 2020.
Maria Khrenova/TASS via Getty Images
Lise Eliot, Rosalind Franklin University of Medicine and Science
Rather than distinctly male or female, the human brain is much more like the heart, kidneys and lungs – basically the same no matter the sex of the body it's in.
Exercising can increase your need to drink water, but there’s no need to overdo it.
The Great Brigade/Getty Images
If kidneys could talk, they'd tell you not to overdo the water rule you hear all the time. But since they can't talk, they do send signals to your body that enough is enough.
Looking for bits of DNA at the University of Florida.
David Duffy
Can companies legally require workers to get vaccinated? Employers have gotten so good at finding ways to get employees to comply with their policies that it may not matter.
Studies show that family acceptance or rejection has a big impact on a trans child’s mental health and happiness.
Scott Hoon / Barcroft Media via Getty Images
Ryan Wiser, Lawrence Berkeley National Laboratory; Bentham Paulos, Lawrence Berkeley National Laboratory; Dev Millstein, Lawrence Berkeley National Laboratory, and Joseph Rand, Lawrence Berkeley National Laboratory
Fifteen years ago electric power generation was the largest source of US greenhouse gas emissions. Now the power sector is leading the shift to a clean energy economy.
The famine in Samaria was one of many depicted in the Bible.
PHAS/Universal Images Group via Getty Images
The genius of the Paris climate agreement was getting major oil producing countries to agree to a target, but they still have widely different views of energy's future.
Super League plans have fans screaming into the void, like soccer star Lionel Messi here.
Josep Lago/AFP via Getty Images
More competitive games between top soccer clubs is desirable but creating a 'closed' system would harm a soccer culture built on dreams, says the man who predicted the Super League two decades ago.
Ethicists disagree on whether people are morally obligated to take small actions that – on their own – contribute only slightly to the collective good.
Justin Tallis/AFP via Getty Images
Alexander Testa, The University of Texas at San Antonio and Chantal Fahmy, The University of Texas at San Antonio
For the 6.5 million Americans who have an incarcerated family member, COVID-19 has made an already stressful situation much worse by drastically limiting communication and raising fears of death.
Having a diverse set of friends supports youth development.
Mark Lennihan/AP
Researchers consider how friendships that bridge across social class – "cross-class friendships" – contribute to middle school academic achievement differences based on level of parents' education.
Vials of the Johnson & Johnson vaccine to prevent COVID-19. The use of this particular vaccine has been halted temporarily.
Justin Tallis/AFP via Getty Images
The one-dose vaccine developed by Johnson & Johnson is temporarily halted because of potentially serious blood clots seen in six women. An immunologist explains what this means for you.
Beverly Cleary’s beloved characters, including Ramona Quimby and Henry Huggins, have enthralled readers for decades.
AP Photo/Anthony McCartney
As sea levels rise along the Atlantic coast, saltwater is intruding inland, killing trees and turning coastal forests into marshes. Should scientists try to slow the process, or work with it?
Leeuwenhoek refined the magnifying glass, creating the world’s first microscope.
Tetra Images via Getty Images
Van Leeuwenhoek, who discovered bacteria, is one of the most important figures in the history of medicine, laying the groundwork for today's understanding of infectious disease.
Vaccine production staff demonstrate operations at a facility in Germany.
AP Photo/Michael Probst
Young people might take on a lot of debt without considering its consequences for their older years. A philosopher makes a case for laws to limit that debt as a duty toward self.
Money from the $1.9 trillion American Rescue Plan could go toward much-needed improvements to crumbling public school buildings.
Erin Clark for The Boston Globe via Getty Images
The unprecedented wave of federal funding could be used to modernize public schools – the second-largest public infrastructure in our nation, behind only highways.
Many parents have had to play the role of a substitute math teacher during the pandemic.
damircudic/E+ via Getty Images
Parents thrust into the role of math teacher can take simple steps to help their children understand math better and dread it less.
A sign shows the way to a recovery area to monitor any immediate side effects from the COVID-19 vaccine on Dec. 17, 2020, in Reno, Nevada.
Patrick T. Fallon /AFP via Getty Images
Many people never experience the least bit of discomfort from the COVID-19 vaccines, but mild side effects are common. They include swelling in the affected arm, nausea and chills.
During the pandemic Americans turned to CBD, which purports to have calming effects.
Catherine Falls Commercial/Getty Images
Hemp, CBD and marijuana are all forms of cannabis – but they are different in significant ways, from form and legality to their potential uses as treatment for various health conditions.