16 The shuttle commode requires that astronauts align themselves precisely in the dead center of the seat. (discovermagazine.com)
The Fastaction Fold LX lives up to its name by being one of the easiest strollers to fold — it simply requires pulling up on a strap at the center of the seat to automatically collapse and lock into place. (pregnancymagazine.com)
If you're placing only one car seat in the back seat, install it in the center of the seat — if a good fit is possible — rather than next to a door to minimize the risk of injury during a crash. (mayoclinic.org)