Why are most Pencils yellow?

Who invented the Pencil? Why do Pencils have numbers on them? Do Pencils really contain lead? And for today's awesome 5 Minute SMARTYQUIZ - check out the SMARTYQUIZ email. If you're not getting our free SMARTYQUIZ email, you are really missing out on making fun memories & locking in the learning with our research-backed gamification - it's our gift to you 3 times a week! Sign up here. For free home activities sign-up at www.WhoSmarted.com