Observational studies are about as reliable as a little old lady who claims that she can identify the perpetrator of a crime because she saw him through the rain from her window two blocks away.

FORBES: Clinical Trial Advice For Investors From Two Pros

Later that night rain pounds fiercely on the wide leaves of the palms outside my window and lightning flashes perilously close to the Buddhist temple next door.

BBC: Cambodia: Silenced by a brutal past