An curved arrow pointing right. When a jar is vacuum-sealed, the different air pressures make it hard to open. But you can use a few simple tricks to break that stubborn seal. Follow Tech Insider ...

Every once in a while, we encounter an incredibly stubborn jar that simply refuses to open, no matter how hard we try. Oftentimes this is because the last person to use the jar screwed the lid on ...

Impossible, that is, without the aid of a jar opening trick or two - we'll get to those soon. Why are jars so hard to open? The main reason is one you can hardly begrudge: It's the vacuum seal ...