And although we've known that for years, this is the first big scientific proof of that relationship.

CNN: Simple test may determine smokers' lung cancer risk

The hypotheses about Leos' intestines and Sagittarians' arms were less than 5% likely to have come about by chance, satisfying the usual standards of proof of a relationship.

ECONOMIST: Why so much medical research is rot

Specifically, Leahy had proposed recognizing same-sex marriages in which one spouse is an American, and allowing U.S. citizens to sponsor foreign-born same-sex partners for green cards given proof of a committed relationship.

CNN: Immigration reform clears key Senate hurdle

In the real world this would be pretty flimsy proof of a cause-effect relationship.

FORBES: Magazine Article