I recently watched a television documentary called Paranatural which brought out something that is so bizarre and mysterious, it could very well be hazardous to human existence without us actually knowing what it is or where it came from.
This documentary brought out that after meteor storms, a gelatinous substance, similar in appearance to frog eggs, has been found on the ground. When touched, the substance will disappear! However, in the tiny bit that was preserved until it could be analyzed, bacterial organisms were found inside the jell. People who have handled this have become quite ill in Oakville, Washington.
Some of it that was sent to a governmental research facility was found to have mysteriously and completely disappeared off the shelf. The answer to where this material went was, "don't ask."
Did this toxic material come from outer space or is it man-made? Analysis by an independent laboratory found bacteria, but also a cell of unknown origin with a nucleus which resembled a white blood cell. However, this, too, eventually disintegrated.
Records at the Historical Society of Pennsylvania in Philadelphia show that this has been happening since medieval times.
It may be that alien life has always been pollinating our planet.