washingtonpost.com Video by: Tracy Grant / The Washington Post Editor: Jacqueline Refo / washingtonpost.com
Watch as 13-year-old Gwendolyn Banks, 13-year-old Chloe Outen, 12-year-old Akeira Cramer and 12-year-old Imon Parker demonstrate their speedy cup stacking skills. Don't blink, or you might miss it!
