The man with 1,000 Klein Bottles UNDER his house - Numberphile

Caption notes

On Numberphile, Cliff Stoll recalls how he made his first glass Klein bottle and why he later ordered a large batch. Making one by hand took him days, he says, and small production runs were expensive per bottle. A larger order brought the price down to a level at which he could sell the bottles, while creating a storage and retrieval problem. In the second half he describes the stock under his house and the small robot he uses to retrieve boxes.