The Northern Hemisphere gets its biggest dose of daylight.
Takmeng Wong and the CERES Science Team at NASA Langley Research Center
The tilt of Earth's axis as it orbits the sun results in the seasonal changes.
The rule of law can take on different meanings depending whom you ask and where you are – but in the US it pretty much means one thing.
An ingredient in toothpaste and other personal care products may be harming the microbes in our gut and leaving us vulnerable to disease.
Triclosan is found in thousands of personal care products from toothpaste to soap. New research links it to inflammation and cancer in the gut in mice, by disrupting their microbiome.
Mass. Gov. Charlie Baker signed a comprehensive energy law in 2016 that authorized the development of new offshore wind and hydroelectric projects.
Massachusetts governor’s office
Several states, including Massachusetts and Rhode Island, have developed ambitious renewable energy targets that hinge in large part on getting their power from turbines stationed in the water.
Morning smog in New Delhi, India.
AP Photo/Manish Swarup
According to one study, more than 8 million people per year die early from air pollution exposure.
Sen. Chuck Schumer of N.Y., accompanied by Democratic members of the House and Senate in late 2017.
AP Photo/Jose Luis Magana
The Democratic Party is a mishmash of causes and interest groups. The party's future will be determined by how its leaders balance and align the interests of its diverse factions.
Preschool today, success tomorrow.
AP Photo/Elaine Thompson
Research suggests that government spending on very young children is a good investment.
A working mom, off the clock.
This penalty can amount to more than 15 percent of a mom's paycheck. Ramping up paid maternity leave and high-quality child care would probably help narrow the gap.
Sexual assault and harassment are prevalent at U.S. colleges and universities.
Jason Salmon from www.shutterstock.com
Colleges and universities can rid their campuses of sexual assault and sexual harassment if they do a few key things, a group of researchers argue.
Palestinian laborers work at a construction site in an Israeli settlement near Jerusalem in 2017.
AP Photo/Oded Balilty
The Trump administration may believe they have the key to an Israeli-Palestinian peace agreement – when others have failed. But it ignores how Israelis and Palestinians feel about such an agreement.
July 4th in a Dallas suburb.
Belief in American exceptionalism isn't just at odds with history and facts. It undermines the country's capacity to address looming challenges.
Instability is the norm in politics.
Our current politically turbulent times in the US are difficult – but not unusual. History shows that fragility is the norm. Get used to it. What is unusual are moments of calm.
A person, pictured here, donating blood. Blood shortages occur often in the U.S.
AP Photo/Mel Evans
The US is once again experiencing a shortage of blood, a difficult commodity to ship because it is perishable and time-sensitive. Here's how game theory could help solve the problem.
Flames and smoke shroud State Route 33 as a wildfire burns in Ventura, California, Dec. 5, 2017.
Daniel Dreifuss via AP
Intense wildfires in southern California are triggering air quality alerts. Health experts know surprisingly little about how inhaling smoke affects human health, especially over the long term.
Women shipfitters working on board the USS Nereus at the U.S. Navy Yard in Mare Island, circa 1943.
Department of Defense
Thousands of American women moved west to take advantage of wartime employment opportunities during WWII. For some, this version of the California dream was temporary; for others, it lasted a lifetime.
Most mass killers have one common trait – a propensity for domestic violence.
The shooter at the Texas church had beaten his first wife and hurt his infant stepson. This connection between mass shooters and domestic violence is the norm, not an exception.
Wildfire creates an orange glow in a view from a hilltop Oct. 13, 2017, in Geyserville, California.
AP Photo/Marcio Jose Sanchez
Wildfires in California have triggered a public health emergency. One threat is smoke inhalation: Some air readings have registered pollution levels comparable to bad air days in Beijing or Mumbai.
Cash-strapped Hartford is one of a number American cities that have missed out on the nation’s urban renaissance.
Jessica Hill/AP Photo
In the country's wealthiest cities, gentrification is a dirty word. But it's all relative – just ask Hartford and Columbus.
Activists protesting against the recently banned triple divorce.
AP Photo/Altaf Qadri
Muslim women in India struggle with a host of challenges, such as widespread poverty and lack of access to education. Arbitrary divorce was only one of many injustices.
Some of the original advocates for Medicare in the 1960s hoped to eventually extend it to everyone.
Bernie Sanders' single-payer health care plan is bound to be expensive and politically impossible. A simple expansion of Medicare offers a cheaper and more passable path to universal care.