Boulder-size asteroid disintegrated harmlessly over Africa

A boulder-size asteroid disintegrated harmlessly over Africa, just hours after its weekend discovery.It's only the third time scientists have spotted an incoming asteroid on a direct collision course with Earth. The previous times were in 2008 and 2014.The asteroid, dubbed 2018 LA, was discovered out near the moon's orbit early Saturday morning, aiming straight for Earth. NASA reported the latest episode Sunday night.Asteroid trackers at NASA and elsewhere quickly determined the rock — abo