We’re big fans of high-fives—have you seen our best-selling High Five Nifty Note or our head honcho, Jen, dominating the High-Five Challenge? (If you haven’t seen the latter, scroll down, it’s below). Yup, high-fives are the fiber of our hands. And since it’s National High-Five Day (NH5D), who knows, we may just go beyond the standard palm slap and try …