About this episode
It’s a stick with bristles poking out of it. It doesn’t even qualify as a simple machine, but the careful thought and design that went into the creation of the modern, angled bristle, fat handled toothbrush shows just how much … Continue reading → Subscribe to SiriusXM Podcasts+ to listen to new episodes of 99% Invisible ad-free and a whole week early. Start a free trial now on Apple Podcasts or by visiting siriusxm.com/podcastsplus . Hosted by Simplecast, an AdsWizz company. See pcm.adswizz.com for information about our collection and use of personal data for advertising.