Scientists know the Zika virus causes devastating birth defects but they can't yet tell how big a threat it is or what to do about it. It's not just pregnant women who are worried — now it's touched baseball. Major League Baseball is relocating two upcoming games from Puerto Rico, responding to players' fears that they might get Zika in the U.S. territory and bring it home. Zika mostly is spread by mosquito bites, and so far that isn't happening in the mainland U.S. That's why health officials have been urging pregnant women not to travel to Zika-affected parts of Latin America or the Caribbean. Puerto Rico is among the areas hit by the growing outbreak. But Zika also can be spread through...
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