21.   Dust particles can cling to baseboard heating fins and then can be blown against the wall to form the familiar stain that looks like smoke.

22.   Dusting sprays are also useful because they give the dust cloth or mop an electrostatic charge that attracts dust particles.

23.   Each dust particle would consist of tiny sensors with a miniature parachute, microphone and infrared detector.

24.   Employees in green head covers and lint-free white suits and green gloves sand the parts, wash off acetone and remove dust particles.

25.   Even these are subdivided, because they are actually orbiting swarms of ice chunks, ranging from the size of dust particles to the size of houses.

26.   Face masks must be worn to combat the acrid stench and airborne dust particles throughout the area.

27.   He understand about dust particles, so he understands why I keep the computer off the floor.

28.   Here in the upper reaches of the stratosphere there are few dust particles to reflect light.

29.   His experiment aboard the shuttle permitted scientists to observe how two types of dust particles behaved after they were dispersed in weightlessness by Columbia crewman Fred Leslie.

30.   In high-resolution images, these interplanetary dust particles vaguely resemble stale popcorn.