cookies to track usage and preferences."
data-cookieaccepttext="I UNDERSTAND"
data-cookiedeclinetext="Disable Cookies"
data-cookiepolicytext="Privacy Policy">
Scientists are revealing new secrets of the reflex that protects our lungs, spreads disease and irritates us all
Close X
This is not a paywall.
Knowable Magazine is free to read. But just because our articles are free to read doesn’t mean they are free to produce. If you value our trustworthy science journalism, please support it with a donation.
