By Anne Bolen

On Aug. 21, for the first time since 1918, a total solar eclipse will cross the U.S. from coast to coast. Along the path of totality, the moon will completely block out the sun, turning day to twilight for nearly three minutes. While a partial eclipse will be visible throughout the U.S., millions will be flocking to spots along the path of totality, which begins in Salem on Oregon's coast about 10:15 a.m. Pacific Daylight Time and exits the nation at Charleston, South Carolina, where maximum coverage will occur about 2:47 p.m. Eastern Daylight Time. Perhaps no other natural event will inspire so many people to go outdoors.