11.   The valve draws its name from the spring-loaded toy that children jump up and down on.

12.   Their jittery children also jump when doors slam.

13.   Use by just one person prevents collisions and excessive force that can cause serious injuries when children are not jumping in unison.

14.   When the children jumped from their chairs and began chasing each other, she patiently brought them back to the table and returned to reading to them.

15.   Children jumped in delight and adults cheered as trucks loaded with supplies trundled into Sarajevo on Sunday for the first time in six months.

16.   Children jumped in delight and adults cheered as trucks loaded with supplies trundled into Sarajevo Sunday for the first time in six months.

17.   Children jumped up and down in delight and adults cheered as trucks loaded with supplies trundled into Sarajevo Sunday for the first time in six months.

18.   Children jumped off a large iron pipe that juts into the water.

19.   Children jumped up and down on a storm-downed palm tree branch, using it as a trampoline.

20.   The children jumped up and down and waved plastic Cuban flags.