Science fact is crossing over into science fiction today.
First, astronomers have located an earth-like planet orbiting close to a star some 20 light-years away. This planet is a little larger than Earth, so we’d feel heavier than normal if we could walk on its surface. Sounds mighty like the conditions on Kal-El’s homeworld, if you ask me, though of course it supposedly blew up.
Second, geologists have discovered a mineral with nearly the same chemical composition as the fictional kryptonite in Superman Returns. It’s not radioactive and it’s not green, but it’s the next best thing.
Now, if we can determine that the mineral came from the distant planet, that’ll clinch it. Somewhere on some farm on Earth is a boy learning that he can leap tall buildings in a single bound and run faster than a locomotive.