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I have never written anything about worm holes... and I won't

How do I learn about the wormholes? ;(

However, I like writing about dark matter. And sometimes black holes

I've learnt much from you already. But I still need to learn more from you :)
Now I'm sounding like Oliver Twist

You should learn general relativity first :)

Ok sir, thanks a lot. I should lay my hands on books on relativity then