brings relief to victims of war or natural diaster.

Cross pollination brings genetic diversity to plants. This tends to make them stronger and healthier overall, with fewer problems being caused by a limited gene pool.

The two kids go across, one brings the boat back while the other kid stays on the other side. Then 1 adult goes across, and the kid that stayed on the other side brings the boat back. The two kids cross again, and 1 kid brings the boat back. The other adult crosses the river, and the other kid brings it back. Then finally the two kids cross and... voila!

According to the folklore it is only bad luck if you cross the black cat's path.

The cross appeal rule states that a remedy in favor of an appellee can only be justified if the appellee brings a cross appeal.

In Greenlaw v. United States, the Supreme Court held that an appellate court violated this rule when it imposed a minimum sentencing hike on the appellant even though the appellee (state) had not filed a cross appeal.