The Leidenfrost effect, also called the "mercury ball test", is a technique used to make sure your pan is hot enough for ...

They're less likely to have included keypads or fingerprint ... phone to unlock the door. They didn't always work properly and we no longer see this option on new smart locks.

But SwitchBot has made it easier to use this technology with its new Lock Ultra. It retrofits onto 99.9% of existing door locks ... including fingerprint scanning. It can store up to 100 ...