Some microwaves take a useful shortcut with a sensor for water vapor, so they know when something has started to steam and can reactively change the amount of t

Some microwaves take a useful shortcut with a sensor for water vapor, so they know when something has started to steam and can reactively change the amount of time remaining. Obviously this is great for things like soups, but not-so-much for things which don't reach 100C in an even fashion.