Heim, is a columnist for PC World and prolific writer on needlecrafting.
Jeffrey Bennett is an astrophysicist and educator who proposed the idea for and helped develop the Voyage Scale Model Solar Systemthe first science-oriented exhibit approved for permanent installation on the National Mall in Washington, DC. He is the lead author of bestselling college textbooks in four distinct disciplines: astronomy, mathematics, statistics, and astrobiology. He lives in Boulder, Colorado. Alan Okamoto is a children's book illustrator and a space artist who has done commissioned work for the Air Force, numerous aerospace corporations, and college textbooks. He lives in Lodi, California.