Details and FAQs on the COVID-19 Response website.
Start it spinning and watch the law of conservation of momentum run its course. As friction begins to slow its spin, the disk tips over and rotates in a flatter orientation, which increases its moment of inertia, allowing for angular momentum to be conserved even with a reduced rate of rotation. The disk will even "walk" around in small circles consistent with its angular momentum.
Just remember to pronounce it correctly ("oyler").