They don't prefer blondes

The Guardian has some excellent statistics about the Oscars, including:— 43% of best actresses winners have been brunette, only 14% blondes. Playing someone with a mental illness gives you 23% chance of winning, physical illness 10%, an inspirational teacher 5%, Holocaust victim 4%, victim of homophobia 3%, nun 3%, monk, genius + victim of racism all 2%.

The mental illness/nun teacher thing is no big surprise, but the prejudice against blondes. That's fascinating.