I hadn’t heard anything about strangelets (tiny, superdense, hypothetical objects) before, but according to this two-year-old article, Earth may occasionally be getting pummeled by them: Earth punctured by tiny cosmic missiles.
I like stories like this because they remind me how weird and unexpected reality frequently turns out to be. I mean, if I read this story on April 1, I’d be pretty sure it was a hoax. But it appears to be legit.
Thanks to Bravo for the link.