Podcast:99% Invisible Published On: Wed Dec 02 2015 Description: Many material trifles, such as Silly Putty, started as attempts at serious inventions, but in rare cases, the process works in reverse: something developed as a gag gift can turn into something truly heroic. Invented by high school prankster Alan … Continue reading → Subscribe to SiriusXM Podcasts+ on Apple Podcasts to listen to ad-free new episodes and get exclusive access to bonus content.