Medicine, any science, aerospace, military. Food packaging is in both, and nutrition information is listed in grams. Engineering is an annoying mix of both. Construction is still mostly imperial which often causes the former annoying mix. Cooking and baking is usually imperial but increasingly in metric as well. Anything international is done in metric.

It is in all the areas that matter. Who cares if our road signs and weather reports aren’t.

Celsius isn’t even used in science. Kelvins are used.

We do use metric in America. All the time actually. It’s taught in high school science classes. We use it in science, medicine, aerospace, military, and engineering.

Anybody who’s lived anywhere that has a proper winter knows that it isn’t as simple as below freezing = ice and above freezing = water.

To get real pedantic, the planets in the solar system besides Earth don’t have any biomes because they don’t have any life as far as we know.

One. But I never hear it, I always wake up before it.