Freelance journalist Gabriel Popkin and host Sarah Crespi discuss what will happen to ash trees in the United States as federal regulators announce dropping quarantine measures meant to control the emerald ash borer—a devastating pest that has killed tens of millions of trees since 2002.
Instead of quarantines, the government will use tiny wasps known to kill the invasive beetles in hopes of saving the ash. Sarah also talks with Pavel Chvykov, a postdoctoral researcher at the Massachusetts Institute of Technology, about the principles for organizing active matter—things like ant bridges, bird flocks, or little swarms of robots.
Coronavirus appears to spread more slowly than the flu. This is probably the biggest difference between the two. The flu has a shorter incubation period (the time it takes for an infected person to show symptoms) and a shorter serial interval (or the time between successive cases). Coronavirus’s serial interval is around five to six days, while flu’s gap between cases is more like three days, the WHO says. So flu still spreads more quickly.
Don’t blame snotty kids—adults are passing coronavirus around.
Scott Burger, MITEI Energy Fellow and researcher, discusses rooftop solar economics, net metering, energy poverty, and electricity costs. Show notes and transcript: 
It’s a familiar tune to engineer Ken Smith, director of the mobility division of the Stanford Center on Longevity. He says one of the biggest mistakes designers make is to assume that around the age of 60 people lose interest in aesthetics and design. This can have dire consequences for products meant to help people with their health. No one wants to stick a golf-ball-size hearing aid the color of chewed gum in their ear, any more than they want to wear a T-shirt that reads “SENIOR CITIZEN.”
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