Yeah, and we have plate tectonics which explains... oh, geez, I guess nothing, since we can't fit an entire tectonic plate into a lab in order to repeatedly tes

Yeah, and we have plate tectonics which explains... oh, geez, I guess nothing, since we can't fit an entire tectonic plate into a lab in order to repeatedly test it. Well at least we know that the planet's magnetic field is produced by aligned iron molecules in the core since... Well shit, I guess we can't fit a planetary core in the lab. Ok, I've got one: we know that the sun is a nuclear furnace, fusing hydrogen into helium because... um... Well, I guess you're right. We can't know anything by repeated inference. I sure hope the sun comes up tomorrow.