This has to be one of the most unusual scientific reports I have ever seen. And if you think about the subject matter you might consider it to be a little upsetting.

Strangelets from outer space
http://www.ananova.com/news/story/sm_586092.html

That report proposes that the Earth is occasionally being hit by very tiny objects which can weigh several tons each and which could be traveling at speeds of as much as 900,000 miles per hour. Earthquake records were examined. And the people involved found several from 1993 which they interpreted as possibly indicating that objects like that were hitting the Earth at one location and then exiting about 20 seconds later from some other location.