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The Observatory: On August 13 of each year, the world celebrates the International Day of the Left Hand ("left-handed users") since Dean R. Campbell, founder of the International Organization for Toughness, who l & # 39; 39, celebrated for the first time in 1976, to raise public awareness of the advantages and disadvantages of the use of the hands. To the left.
More susceptible to diseases
Extensive research has shown that left-handed people are more susceptible to disease, such as a 2013 study by Yale University that 40% of people with schizophrenia use their left hand and 11% of those who received diagnosis of mood disorders also use their left hand. Business Daily.
Left-handers around the world represent only 10% of the population, but among them, a number of celebrities, including "the former US President, Barack Obama, a famous artist, Leonardo da Vinci," Actress Drew Barrymore, actor Tom Cruise and American footballer, Pele. "
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