I was going to ask if you're nervous around HF; but I read your earlier reply, you're *cautious* with it.

So...

Will we ever observe conditions in the Mantle directly, or even in the lab with tiny samples under (say) a diamond anvil?


Also, from a previous reply: I *get* your sense of geology and the landscape. I'm no geologist, I'm a Civil Engineer by training, and I read the engineered landscape; it's always an amazing thing, out in a landscape that's there to be read, always more than mere scenery.