WASHINGTON, Aug 23 (Reuters) - It may be wise to check out a stranger's ears before picking a fight, U.S. researchers advised on Monday. They found that women and men with asymmetrical extremities -- ears, fingers or feet of different sizes or shapes -- were more likely to react aggressively when annoyed or provoked. This could make sense, the team at Ohio State University said. Factors such as smoking or drinking during a pregnancy could stress a fetus in various ways, causing not only slight physical imperfections but also poorer impulse control. "Stressors during pregnancy may lead to asymmetrical body...