How many automobile accidents involve the use of cellphones?
—Billy Robinson, Denver, Colo. In a study released by the National Highway Traffic Safety Administration, nearly 80% of automobile accidents involved some form of driver inattention within three seconds before the event. The most common distraction was the use of a cellphone, which accounted for 7.2% of all crashes. How can bleach be color-safe? When I use bleach, I want to remove a spot of color, not keep it there. —John Krause, Sandy Hook, Conn. There’s a difference between spaghetti sauce and the stable dye used to color fabrics. The former wasn’t developed to stay on your shirt throughout repeated washings, even though it may seem that way sometimes. “Bleach” is a generic term for any chemical that’s used to whiten or remove color. Many types are available, including chlorine, hydrogen peroxide, calcium hypochlorite, and sodium hypochlorite. All have different qualities. If a bleach is strong and intended to whiten an already-white fabric, it may lighten even the stable dye used fo
