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As many as 10-20 percent of the world's population is filled with lefties. Not only write with his left hand, left-handed people are also using devices (gadgets), office supplies, cooking and using various other objects not in his right hand.
Well, here are some unique facts that you may not know about lefties. Check out his review, as quoted Huffingtonpost, Saturday the following:
1. Not only descendant
Until now, scientists did not know for sure why some people are left-handed. Clearly, the genetic factors affecting about 25 percent.
2. Related to stress during pregnancy
In one British study, fetuses of pregnant women who are stressed tend to cause her left-handed. Other evidence supports that theory. 2008 study in Sweden found that women who experience depression or stress during pregnancy tend to have a left-handed child. In another study, infants with low birth weight or born to older mothers, also left-handed.
3. More risk of mental health problems
According to a study at Yale University in 2013, the left-handed people have a greater risk of psychotic disorders such as schizophrenia. When researchers surveyed patients at a mental health clinic, 40 percent of whom are schizophrenic writing with the left hand. Another study also found an association between handedness with dyslexia, attention deficit hyperactivity disorder (ADHD), and some mood disorders.
4. The sports experts
Left-handed people tend to have expertise in the field of sports. Professor of psychology at the University of Texas-Austin, Ronald Yeo, PhD says, in the book The Puzzle of Left-Handedness, Rik Smits explains how the coaches are so easy to teach players, boxers and baseball players are left-handed.
5. High-risk breast cancer
In a 2007 study published in the British Journal of Cancer, researchers found that left-handed people have a higher risk of developing breast cancer at age especially after menopause.
6. Natural risk of autoimmune disorders
Yeo said that the lefty could be a risk factor for autoimmune disorders. Although there has been no research to support, a number of theories have been proved. A 2001 study found that left-handed people twice the risk of suffering from intestinal problems such as Crohn's disease and ulcerative colitis than right-handed users.
7. Trouble sleeping
Researchers found that 94 percent of people are left-handed have periodic limb movement disorder (PLMD), which makes it difficult to sleep.
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