In one study, subjects watched a 30-second clip of college teachers at the beginning of a term and rated them on characteristics such as accepting, active, competent, and confident.

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Born in California in 1913, Nixon had a brilliant record at Whittier College and Duke University Law School before beginning the practice of law.

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According to Billy Soo of Boston College, such red flags tend to pop up at the beginning of auditors' tenures, when accountants are too green to spot potential problems, and again well into the relationship after about 14 years, he and colleagues calculate.

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Many parents want to keep boys and girls separate in schools beginning at the intermediate education level, says Shrimohan Arora, school manager at the Amar Chand Kanya Intermediate College for girls in Atrauli, Uttar Pradesh state.

CNN: For a girl in rural India, education is a difficult pursuit