If you’re a left-handed person, congratulations: today is your day. Demand acknowledgment from your friends, family, and peers. The world is a more challenging place for you and the 15% of the population who are your brethren. Statistically speaking, puberty starts 4 to 5 months later for you lefties, your average lifespans are 9 to 14 years shorter than righties, and spiral notebooks exist simply to ruin your life…