Why Do We Use One Hand More Than The Other?

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Across
  1. 4. Left handedness may benefit players of this team sport
  2. 7. A synonym for preferred hand is _______ hand.
  3. 8. The author wrote a parenthetical comment "(It's going to get worse.)" What was going to get worse? His _____.
  4. 11. The author uses a casual, _______ and relaxed tone throughout the article.
  5. 12. _______ is where a person lives and it impacts handedness.
  6. 13. What might people who are left handed be called?
  7. 15. _______ are the biological family ties that impact handedness.
Down
  1. 1. What tool may compel lefties to use their right hand?
  2. 2. How many genes could be involved in handedness?
  3. 3. "Scratching their heads" implies that the scientists are ______.
  4. 5. By what age do humans start preferring one hand over another?
  5. 6. Upper hand means having an _______
  6. 9. The article says that our modern environment sometimes ________ left handed people to use their right hand.
  7. 10. What percentage of people use their left hand?
  8. 14. What percentage of people use their right hand?