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Experts estimate that close to 90% of the U.S. population must be vaccinated to reach herd immunity for COVID-19. David McNew/AFP via Getty Images

What is herd immunity? A public health expert and a medical laboratory scientist explain

Vaccination campaigns like the ones that eventually eliminated polio and measles in the United States required decades of education and awareness in order to achieve herd immunity in the U.S. population.
Public spending aimed at reducing poverty can lead to deep reductions in child maltreatment and could improve overall child well-being. shih-wei/ E+ via Getty Images

State spending on anti-poverty programs could substantially reduce child abuse and neglect

Public investments in benefit programs could save tens of thousands of children from being victims of child abuse and have important later-life effects on child welfare and overall health.
Free bagged lunches are ready for distribution at a public school in Fayette, Miss., on March 3, 2021. AP Photo/Rogelio V. Solis

The pandemic has made it even harder for one in three Americans to obtain healthy, affordable food

A recent survey finds that the pandemic made it harder for many US households to put food on the table. It also changed the ways in which people buy and store food.
On average, two students in every U.S. classroom have ADHD. damircudic/E+ via Getty Images

What causes ADHD and can it be cured?

Even when the condition lasts a lifetime, there are behavioral treatments and prescription drugs that make it easier for people with attention-deficit hyperactivity disorder to thrive.
A volunteer distributes face masks in a rural California community in February 2021. Mel Melcon/Los Angeles Times via Getty Images

Having COVID-19 or being close to others who get it may make you more charitable

Experiments in the US and Italy that observed people’s charitable choices found similar results: People tend to prefer to help local communities.
Your teeth will be better off if you refrain from chomping on ice cubes. Credit: Laurence Monneret/The Image Bank via Getty Images

Is chewing on ice cubes bad for your teeth?

A dentist explains why this is a habit worth breaking – no matter the cause or the strength of your cravings to keep doing it.
Teachers experienced more positive emotions interacting with their students when schools closed during the pandemic. Barrie Fanton/Education Images/Universal Images Group via Getty Images

Teachers say working with students kept them motivated at the start of the pandemic

Teachers’ fondness for working with students grew in the early stages of the pandemic, according to a new study that provides a unique before-and-after glimpse at what duties teachers enjoyed most.
Tiny changes, like a butterfly’s wing flapping, can be amplified downstream in a chaotic system. Catherine Falls Commercial/Moment via Getty Images

What is chaos? A complex systems scientist explains

Part of the 2021 Nobel Prize in Physics was awarded for work modeling Earth’s climate using its chaotic, complex weather. To scientists, chaos lies in the gray zone between randomness and predictability.

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