How could human civilization decline so far, yet seem so normal in many respects? And is it scientifically possible that a blight could wipe out all … - Kip S. Thorne

We don’t know what triggered the big bang, nor what, if anything, existed before it. But somehow the universe emerged as a vast sea of ultrahot gas, expanding fast in all directions like the fireball ignited by a nuclear bomb blast or by the explosion of a gas pipeline. Except that the big bang was not destructive (so far as we know). Instead, it created everything in our universe, or rather the seeds for everything.

There is a maximum spin rate that any black hole can have. If it spins faster than that maximum, its horizon disappears, leaving the singularity inside it wide open for all the universe to see; that is, making it naked — which is probably forbidden by the laws of physics

Pronto aprendimos a llevar varios problemas a la vez: un problema difícil que deba ser visitado y revisitado una vez tras otra a lo largo de muchos meses o años antes de que se abra la cáscara, con la esperanza de una gran ganancia; y otros problemas mucho más fáciles, con ganancias más inmediatas.