21.   Micheletti says he uses his internal clock to measure time spent on a recipe.

22.   My internal clock was confounded.

23.   No internal clock ticks away on his supposedly dwindling Masters chances.

24.   One building owner had a security camera system controlled by a VCR, which had an internal clock that failed the date test.

25.   One thing that can help reset the internal clock, he said, is exposing yourself to morning daylight.

26.   Only, aside from her curious hair color and iffy internal clock, she seemed completely normal and quite nice, working the day away.

27.   Plants listen to nothing but their own internal clock.

28.   Setting your internal clock for regular sleep cycles requires discipline.

29.   Sunrise and nightfall recalibrate the internal clocks of these creatures, so that in winter their biological night is long and in summer it is short.

30.   The goal was to make sure that their processor did something useful with every tick of its internal clock.