Masks and COVID, Voice Cloning, Whistling Artist

If the COVID-19 vaccine is so effective, why are people who’ve had the shots being told to wear masks in public again? Then, artificial voices are becoming so natural-sounding they’re prompting all kinds of ethical questions. Plus, whistling as you’ve never heard it before. Also, on today's show: how chemists are designing an opioid that works for pain, but without the addictive side effects; how one worker bee in the 1990s managed to clone herself into an army that’s still taking over – and collapsing – healthy bee colonies in South Africa today; compelling Olympics stories date back to the ancient origins of the games. (Matt O’Brien/AP Photo)