Why don't bicycles fall over?

<p>It's all about bikes in this episode of <em>But Why?</em> How come bicycles stay up when you're riding, but fall over once you stop? We turn to Andy Ruina, professor of engineering at Cornell University, for the scientific answer. We also learn how a bike chain works and Olympic mountain biker Lea Davison tells how to get started when riding.</p> <p>Download our learning guides: <a href="https://npr.brightspotcdn.com/7a/31/211ee40f41eeb02c757028e98dd9/why-dont-bicycles-fall-over.pdf" rel="nofollow" target="_blank">PDF</a> | <a href="https://docs.google.com/presentation/d/1S2DmPdhvPkM-otK0t9FawHL116GLwYHMGJxyK2mndL0/copy" rel="nofollow" target="_blank">Google Slide</a> | <a href="https://npr.brightspotcdn.com/4d/56/f130233d427d997cb80a9b876a9d/butwhy-213-bikes-transcript.pdf" rel="nofollow" target="_blank">Transcript</a></p>