If a 6-month-old can distinguish between 20 dots and 10 dots, he or she is more likely to be a good at math in preschool. That’s the conclusion of a new study, which finds that part of our proficiency at addition and subtraction may simply be something we’re born with. Learn more at http://news.sciencemag.org/brain-behavior/2013/10/babies-are-born-some-math-skills