Scientists are still unsure what causes hand preference (Photo: left_handers_day, barackobama/Instagram)
Today, August 13, marks International Left-Handers Day, an annual observance that recognises left-handed people and the challenges they face in a world largely designed for right-handed users.
Research suggests that left-handers make up about 10 to 12 per cent of the global population, according to lefthandersay.com.
Several famous people are left-handed, including Canadian singer Justin Bieber, who initially used a right-handed guitar and tried to play it backwards.
Finding this difficult, his mother later bought him a left-handed guitar. Singer Dolly Parton also learned to play the guitar similarly.
