The book, Who Moved My Cheese?, is the first best seller of Spencer Johnson.

Spencer Johnson, a onetime physician and children’s book author, whose best-selling books on business management, including The One-Minute Manager and Who Moved My Cheese ?, sold millions of copies and inspired a cultlike following, died July 3 at a hospital.

L’Oreal debuted the wearable at this year’s Consumer Electronics Show in Las Vegas, and it was released to the public in June. CES may seem like a strange place for a makeup company, but L’Oreal has had an incubator for some time now, and in 2011 the company hired biophysicist Guive to run it, with the mandate to create new products at the speed of a tech startup.