Physics. It's not rocket science*, but it's taken this long for an oven manufacturer to realise that hot air rises. This means that every time you open your oven all the hot air escapes, dropping the temperature from 200 °C to 100 °C in a matter of seconds. The canny team at Siemens have thought long and hard about this issue and come up with the liftMatic oven. It's a wall-mounted unit, and instead of opening with a door like conventional ovens, the liftMatic has a platform that lowers, giving you easy access to your food, but keeping all the toasty warm air captured inside the oven itself. And as a bonus feature, the liftMatic has a push-button cleaner that heats the oven to very high temperature and turns any cooking residue to ash. That's what I'd call physics in action.

*Although rocket science is physics.