Left-handed: Scientists have found out more about why we use different hands
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Scientists have found out more about why some people are left-handed.
About one in 10 people is left-handed and it's never really been understood why people use that hand over their right.
But scientists at the University of Oxford say it could be down to genetics - after finding the first genes linked to being left-handed.
The genes are hardwired, or permanently connected, into human DNA and found in a part of the brain that deals with language.
Genes are short sections of DNA, which carry information for particular characteristics, such as ear shape or eye colour. They are passed on from a parent to a child.
DNA carries genetic information. It has all the instructions that a living organism needs to grow, reproduce and function.
Why are people left-handed?
One of the researchers told the BBC: "It tells us for the first time that handedness has a genetic component."
But there are still many mysteries when it comes to the connection between brain development and which hand you use.
Famous lefties include former President of the United States Barack Obama, the Duke of Cambridge, singers Niall Horan and Justin Bieber and Little Mix's Jesy Nelson.
Justin Bieber, Niall Horan and Jesy Nelson are all left-handed
Are you left-handed? Let us know in the comments!
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