How I Built This with Guy Raz

Springfree Trampoline: Keith Alexander & Steve Holmes (2019)

In the late 1980s, a New Zealand engineer named Keith Alexander wanted to buy a trampoline for his kids. After his wife said they were too dangerous, Keith set out to design his own—a safer trampoline, without metal springs. He tinkered with and perfected the design over the course of a decade. But he was daunted by the challenge of bringing his invention…