Aliens and UFOs

Aliens. Do they exist? Are they here with us now? As many fictional stories have been written, as many accounts have been witnessed and filmed, it all comes down to one thing. Do you believe? So far, no one has offered irrefutable evidence of alien life among us, nor have scientists discovered life elsewhere in our universe. Theories abound, some people swear they have seen them, and yet, where are they?

Here is my own point of view driven by logic, modern physics and science. You may draw your own conclusions and choose what to believe.