Welcome to Sunday! The top five stories on our site this week are displayed below.

Editor’s pick: Earlier this week when I learned that the Biden administration had issued new rules for the “forever chemicals” called PFAS, I reread this 2020 story by Carol Kwiatkowski to get up to speed on the concerns behind the ruling. The biologist explains why these chemicals are so widespread and so risky. “They move easily through air and water, can quickly travel long distances and accumulate in sediment, soil and plants. They have also been found in dust and food, including eggs, meat, milk, fish, fruits and vegetables,” Kwiatkowski writes. Over time, evidence has slowly built that some commonly used PFAS are toxic and may cause cancer.

Emily Costello

Managing Editor

People navigate cities in much the same way animals navigate their environments. Max Böhme/Unsplash

Cellphone data shows that people navigate by keeping their destinations in front of them – even when that’s not the most efficient route

Carlo Ratti, Massachusetts Institute of Technology (MIT)

As you’re walking through city streets on your way to work, school or appointments, you probably feel like you’re taking the most efficient route. Thanks to evolution, you’re probably not.

The fight over the minimum wage continues. AP Photo/John Raoux

Does raising the minimum wage kill jobs? The centurylong search for the elusive answer shows why economics is so difficult – but data sure helps

Veronika Dolar, SUNY Old Westbury

The question is actually one of the most studied in all of economics and still doesn’t have a definitive answer – though Nobel-winning economist David Card got us closer.