1.   Her laughter gave way to gratitude for the medical experts who brought her through.

2.   Laughter gives us a clue that we have powerful systems in our brain which respond to pleasure, happiness and joy.

3.   Laughter gives you a foothold on the neurobiology of behavior, he said.

4.   Laughter gave way to puzzlement as the audience encountered scenes of sidewalk cafes, ships moored to docks and punk-rock bands playing in the street.