Slushy hailstones of ammonia and water were part of a bizarre theory to explain the planet's poorly mixed atmosphere. These mushballs seem to be real, say UC Berkeley scientists.

FRIDAY (GOOD FRIDAY): Sunny and milder with high clouds filtering in, high 71. SATURDAY: Rather cloudy and mild, but still a decent day to get outdoors, high 81. A late day/evening shower can't be ...