Despite the objections of some posters who seem to have weird vendettas and calling me vile names like PD, logic will always rule the day.
I have in fact explained sitcom math in the thread. It is an equation initially meant to show that there are likely a high number of alien civilizations. It is based on real factors and there really isn't too much wrong with it. Rather than go into it all again I'll say:
If all of the unknown factors in the equation are very close to zero, but not zero, the number of civilizations would be incredibly high.
We have been collecting and analyzing signals from space for decades. This involves all points in time since the beginning and all directions. Not a solitary thing has been found indicating a civilization in any way.
Any objective unemotional view of the above two points leads to the obvious conclusion that there is simply nothing to be found.
People can yammer on and on attempting to poke holes in that, but they either fail to look into all of the implications of the above or they do and they remain in denial. I did that homework in this thread already. The above is the Cliff notes version.
Note:. This logical conclusion applies only to the observable universe, not to other dimensions or other parts of a possible multiverse.