A glass which is impossible to drink from, sustainable diapers and an email paywalls. Here are just some of the business ideas going through the head of Jim McKelvey, one of the most extraordinary entrepenurs we know.

Jim was a cofounder and now board member of Block (the $50bn fintech formerly known as Square) also is also chairman of the St. Louis Federal Reserve and founder of Invisibly, a startup backed by Peter Thiel’s Founders Fund.