A nurse administers the Pfizer-BioNTech COVID-19 vaccine to a patient in London on December 8. Some experts say the fastest way to test second-generation COVID-19 vaccines is through human challenge trials.

A Brief History of Human Challenge Trials

For more than two centuries, scientists have been intentionally infecting patients with dangerous diseases in order to learn more

PEZ has designed about 1,400 different character heads and innumerable variations.

How PEZ Evolved From an Anti-Smoking Tool to a Beloved Collector's Item

Early in its history, the candy company made a strategic move to find its most successful market

Arctic ground squirrels are such adept hibernators that they can remain in their slumber for up to eight months by slowing their metabolic system down so greatly that they only need to breathe once per minute.

What Hibernating Squirrels Can Teach Astronauts About Preventing Muscle Loss

The Arctic ground squirrel recycles nutrients in its body, allowing it to slumber for up to eight months and wake up unscathed

The Chicken Soup Manifesto features delightful dishes from Ethiopia, Vietnam, Greece and other countries across the globe.

A Journey Around the World, as Told Through Chicken Soup

In her latest book, Portland-based chef Jenn Louis catalogs more than 100 recipes from 64 countries

In February, the Covid-19 pandemic halted polio immunization campaigns across Afghanistan and Pakistan, fueling a new resurgence of polio in children. Here, a young girl is given the polio vaccine in the Kabul Province in October after campaigns were resumed.


How Covid-19 Drove New Polio Cases in Afghanistan

Due to the pandemic, a total of 50 million children did not receive the polio vaccine in Afghanistan and Pakistan

Children who have been infected with the virus often experience mild or no symptoms at all, making them less likely to get tested.


More Than 1 Million U.S. Children Have Had Covid-19 Since the Start of the Pandemic

Almost 112,000 children tested positive during a one-week period ending on November 12, the largest single week increase in coronavirus cases in kids

The study was small, lacked diversity in its participants and may have been affected by the volunteers’ expectations of taking the psychedelic drug. However, it suggests that this may be a fruitful path in the search for new antidepressants.

New Research

Active Ingredient in 'Shrooms' Shown to Help Treat Depression

A small study on the effectiveness of psilocybin and psychotherapy presents promising evidence

But since 2010, the percentage of children around the world receiving the first vaccine has plateaued at around 85 percent; only 71 percent receive the second dose.

A Resurgence of Measles Killed More Than 200,000 People Last Year

Public health experts worry that vaccine availability will be further stalled by the Covid-19 pandemic

Scholars will use A.I. to identify references to specific scents in artwork and texts.

Researchers Are Recreating Europe's Centuries-Old Scents

A team of scientists will curate an "encyclopedia of smell heritage" that spans the 16th through early 20th centuries

In downtown Detroit, Lafayette Greens is an urban garden and public green space where visitors can watch live music, enjoy local art installations, and take community yoga classes, all while watching butterflies flit from plant to plant.

Innovation for Good

Are 'Edible Landscapes' the Future of Public Parks?

Green spaces planted with fruits, veggies and herbs are sprouting across the globe, and the bounty is meant to share

Electron microscope image of a human cell (purple) heavily infected with SARS-CoV-2 virus particles (yellow)


Will the Coronavirus Evolve to Be Less Deadly?

History and science suggest many possible pathways for pandemics, but questions remain about how this one will end

A woman scratches her forearm.

The Search for What Causes Chronic Itching

Scientists are making headway on parsing the condition's biological underpinnings, in hope of better treatments

Halloween can be a particularly challenging time for families navigating life-threatening food allergies.

Allergic Reactions to Peanuts and Tree Nuts Spike 85 Percent on Halloween

Parents and children can avoid the dangers by taking key precautions and embracing alternative activities

Mary Fowkes, a pathologist at Mount Sinai Hospital in New York, examines brain slices from an autopsy.


Why Autopsies Are Proving Crucial During Covid-19

Advances in medical imaging have reduced the need for the procedure, but it is leading to discoveries that may help with better treatments

An illustration of Legionella bacteria, the cause of Legionnaires' disease

Why Reports of Legionnaires' Disease Are on the Rise in the United States

Though less common than in the past, Legionella bacteria and other dangerous pathogens still lurk in drinking water

A father and his daughter engage in a video chat with their doctor.


Should Parents Test for Covid if Their Kid Might Just Have a Cold?

Experts weigh in on when students with runny noses, fevers, and coughs should be quarantined and checked

A woman with anorexia gets ready to weigh herself.


How Patients With Eating Disorders Have Been Affected by the Pandemic

A recent study suggests that worries related to Covid-19 may exacerbate conditions including anorexia and binge eating

As countries in the Northern Hemisphere enter flu season, experts are looking to patterns from Southern Hemisphere nations as a source of cautious optimism.


What to Expect When Covid-19 and the Flu Season Collide

Experts weigh in on the necessary steps to ensure a mild flu season during the pandemic

The museum is located in Copenhagen's historic center.

The World's First Happiness Museum Opens in Denmark

The Nordic country is consistently ranked among the planet's happiest

School children are spaced apart in one of the rooms used for lunch at Woodland Elementary School in Milford, Massachusetts on Sept. 11, 2020.


Exactly How Far Should You Distance From Others to Avoid Covid-19?

The CDC recommends 6 feet or more, the WHO about half that distance, but experts say the science is far from settled