21.   Art historians are excited about the exhibition because it breaks new scholarly ground by studying the effect the two painters had on each other when they lived together.

22.   As a series of severe thunderstorms marched across western Pennsylvania, momentum from fast, high-altitude winds was transferred to the ground by downdrafts in the thunderstorms.

23.   Avidex and Sunol have broken new ground by creating artificial T-cell receptors that can exist independently from the T cells.

24.   Beginning this month, Trans World Airlines frequent travelers can earn mileage while keeping their feet firmly on the ground simply by dining out.

25.   A dancer, Sally Wicks, climbs up the backs of other performers and plunges downward, her head stopped from hitting the ground by another dancer.

26.   A few inches of slushy snow could whiten the ground by evening in the eastern Dakotas and Minnesota.

27.   A hitter in pursuit of the home run record can eat up ground by hitting two or three home runs in a game occasionally.

28.   A few of the storms may contain gusty winds as momentum from fast winds aloft is mixed toward the ground by currents of sinking air within the storms.

29.   After a single by Cordova and a ground out by Lawton, Coomer drove in the first run with a double into the left-field corner.

30.   Build garden seedlings, Prasek says, from below ground by using a potassium product, preferrably one that is organic.