1.   Before you know it, a mitochondrial matriline has crossed a continent, while the Y chromosome has not so much as crossed the living room.

2.   But during the past two summers, I crossed the continent twice, and each time I spent a full week in the heartland.

3.   But that does not mean the virus will cross the continent on the wings of crows or even mosquitoes, researchers say.

4.   Canadians wishing to cross their country have driven south to the United States, crossed the continent on a U.S. carrier, and then traveled north to Canada again.

5.   Cross the continent with rail?

6.   It is a show worth crossing a continent to see.

7.   She crossed the continent and stayed with her grandparents in Maine.

8.   The Carlsons, who lived in Los Angeles, did not want to cross the continent each time a broker called.

9.   They all started the stretch run Thursday when they crossed the continent with Skip Away.

10.   Kendrick said getting to America on Christmas Day would give the balloonists a good chance to cross the continent on a fast jetstream.