[dragonwriter]

Its possible to superheat water in a microwave so that it will explosively boil when disturbed, but it is fairly easy to safeguard against, as well.

[mprovost]

My microwave has a picture of a cup with a spoon in it, this stops superheating.

[benj111]

How?

[briHass]

It provides a non-smooth surface to induce steam bubbles to form.

I know in chem labs we used to use little chunks of ceramic for test tubes, but those aren't desirable in your tea.

[benj111]

>My microwave has a picture of a cup with a spoon in it, this stops superheating.

This appears to be a microwave setting. I don't see how that would provide a non smooth surface

[dragonwriter]

“My microwave has a picture on it” is what was said; graphic instructions are common.

[benj111]

Ah ok I see now!