this morning on "world news now," signal search. underwater pings possibly from flight 370. new developments coming in right now as crews look and listen for signs of the missing jet. april anxiety courtesy of mother nature. the extreme downpours, wind storms and tornadoes ripping up the south and threatening the northeast. the damage and the heartbreak this morning. health alert for mothers to be. a major risk during pregnancy and an easy and inexpensive way to avoid it. >> and switching partners on "dancing with the stars." the competition takes a new twist and turn and you will see who may be a step ahead of the rest. that's coming up on "the skinny" this tuesday, april 8th. this tuesday, april 8th. >> from abc news, this"wor >> from abc news, this is "world news now," with john muller and diana perez. good tuesday morning. search for flight 370 refocusing