April is National Knuckles Down Month so celebrate by trying your hand at one of Abraham Lincoln’s favorite games–marbles.  Practice the true shooting technique: turn your hand palm up with all of your knuckles (except for your thumb) touching the ground.  Place the marble between your index finger and thumbnail and flick it.  Then, test your skills with a homemade course made of jar lids (to hit) and tissue tubes (to roll through).  Or use chalk to draw a three-ring bull’s eye on a paved surface and assign each circle a certain number of points.  Mark a shooting line several feet away.  Then players can take turns trying to score by landing their marbles inside the bulls-eye.