 If you missed any part of this program or you would like to hear it again, subscribe to our podcast or ask your smart speaker to play Science Friday because it can be Science Friday every day of the week. You can also join us throughout the week on social media or with our newsletters, sciencefriday.com slash newsletters. You can also email us at scifry at sciencefriday.com. I'm Rachel Falkman. Aira is back next week. Have a great weekend.