Why did the levees in New Orleans withstand the water and wind of Hurricane Ida? Then, the problem of superweeds—they’re quickly becoming resistant to the most potent herbicides and could soon be causing massive crop losses in the US each year. Plus, a guy who started digging ditches has got a message for parents panicked over a child who doesn't want to go to college. Also on today's show: how researchers genetically engineered mosquitoes to be unable to see humans; the unusual path to stardom for a band that blends slam poetry and whimsy; how chess became a powerful Cold War symbol. (AP Photo/Gerald Herbert, File)