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Seashells can tell you a lot about the sea creatures that made them. Olga Pankova/Moment via Getty Images

Where do seashells come from?

Seashells are the skeletons of sea creatures – and they’re older than you might think.
Denver was barely visible through the smog on Feb. 9, 1986. Pollution like this is why the Clean Air Act was created. Denver Post via Getty Images

What air pollution does to the human body

The EPA is changing how it assesses proposed regulations by dropping the monetary value of health benefits from its cost-benefit analyses. That misses a big piece of the picture.
Sinkholes form when underground rock dissolves or sediment washes away and the surface collapses. Luis Diaz Devesa/Moment Collection/Getty Images

Why Philly has so many sinkholes

Sinkholes are fairly common in Philadelphia due to aging water lines that leak or burst, causing the surrounding soil to wash away.
Beef production provides a valuable contribution to human health while also impacting the natural environment. Brandee Gillham courtesy of the Colorado Department of Agriculture.

Colorado ranchers and consumers can team up to make beef supply chains more sustainable

Beef is a source of complete protein for humans, but its production results in greenhouse gas emissions.
High-speed passenger trains like Florida’s Brightline travel through dense neighborhoods, increasing the likelihood of accidents involving pedestrians. Brynn Anderson/Associated Press

South Florida’s Brightline has highlighted an old problem – every year for the past decade, 900 pedestrians were killed by trains

Railway safety has vastly improved for motor vehicles, but reducing the risk of collisions with pedestrians is much trickier.
Dr. Jonas Salk displays his polio vaccine, which he developed in a University of Pittsburgh laboratory. Bettmann/Bettmann Collection via Getty Images

The world risks forgetting one of humanity’s greatest triumphs as polio nears global eradication − 70 years after Jonas Salk developed the vaccine in a Pittsburgh lab

Polio may finally be defeated in the next 5 years. Will the world recognize what an extraordinary achievement that is?

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