Does your brain need some stimulation [||]? Read this wiki article on the Fermi Paradox.
Basically the paradox is
1 given such a high likelihood of many, possibly millions+, intelligent civilizations existing in the visible universe, & even in our Milky Way galaxy
2 why have 0 of them "hollered at us" [||].
This futurist John Smart has a really mind-blowing [||] theory, that inevitably the most intelligent civilizations will evolve to engineer another universe inside a black-hole [||] type singularity. The parameters of that new universe's physics will be chosen/engineered to maximize the amount of time, energy, & information-processing abilities available. WTF?! This theory would explains the Fermi paradox, in that no intelligent civilization would bother with the energy/time/money needed to colonize other star systems. It's cheaper/better just to cop/design your own universe.