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The Main Rules Collection (5130)
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929
Eyes
SPOTTING A BAD COP
Cops who wear sunglasses on dark days or at night are either alcoholics or don't like their jobs.
John H. Beauvais, Cambridge, Massachusetts
(LR)
Legacy Rule of Thumb from previously published collections
Current Rating:
4.1
out of
10
based on
21
reviews
Comments (1)
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930
Flying
TAKING OFF IN A PLANE
A good minimum runway length for a light airplane is double the manufacturer's recommended distance to climb to 50 feet.
J. Mac McClellan, senior editor, Flying
(LR)
Legacy Rule of Thumb from previously published collections
Current Rating:
4.6
out of
10
based on
15
reviews
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931
Movies and Film
SPOTTING A GOOD MOVIE
Never waste your money on any movie for which the names of the technical crew only all end in vowels.
Dan Wagner, San Jose, California
(LR)
Legacy Rule of Thumb from previously published collections
Current Rating:
3.8
out of
10
based on
21
reviews
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932
Photography
USING A TELEPHOTO LENS
The longer the focal length of a lens, the more important it is to hold it steady, especially at slow shutter speeds. You can generally hand hold a camera with a shutter speed that is equal to the reciprocal of the focal length of the lens. Slower speeds require a tripod.
Jim Crissman, veterinary pathologist, Midland, Michigan
(LR)
Legacy Rule of Thumb from previously published collections
Current Rating:
5.1
out of
10
based on
18
reviews
Comments (1)
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933
Energy
FOLLOWING THE FOOD CHAIN
Different levels in the food chain are called trophic levels. As organisms eat and get eaten, food energy is passed along the food chain. From one trophic level to the next, there is a 90 percent loss of energy.
M. N., Enterprise, Oregon
(LR)
Legacy Rule of Thumb from previously published collections
Current Rating:
5
out of
10
based on
17
reviews
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934
Crime
CATCHING SHOPLIFTERS
Shoplifters are most active on Fridays and Sundays between 3 p.m. and 6 p.m.
Roger Griffin, retail security agency official in Parade magazine, Van Nuys, California
(LR)
Legacy Rule of Thumb from previously published collections
Current Rating:
5.5
out of
10
based on
21
reviews
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935
Equivalents
ESTIMATING WEIGHT
A "Newton" is equivalent to the weight of a small apple.
Scott Parker, data specialist, Beaumont, Texas
(LR)
Legacy Rule of Thumb from previously published collections
Current Rating:
4.4
out of
10
based on
17
reviews
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936
Groups
GETTING WORK DONE
When working unsupervised, two people get more done than three.
Captain Haggerty, animal trainer, actor, author, and philosopher, New York, New York
(LR)
Legacy Rule of Thumb from previously published collections
Current Rating:
5.4
out of
10
based on
17
reviews
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937
Color
ATTRACTING ATTENTION
Red is the color most likely to attract attention. This includes the attention of the police if you drive a red car.
Dennis Palaganas, Gainesville, Florida
(LR)
Legacy Rule of Thumb from previously published collections
Current Rating:
5.3
out of
10
based on
22
reviews
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938
Business
DESIGNING A SUPERMARKET
Supermarket efficiency increases with store size to a maximum of 22,000 square feet. After that, economies of scale are offset by communication problems.
Retail Management Letter
(LR)
Legacy Rule of Thumb from previously published collections
Current Rating:
4.5
out of
10
based on
17
reviews
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939
Insurance
BUYING LIFE INSURANCE
The average family should have life insurance coverage worth at least six times its annual income.
Stephanie Betz, accountant
(LR)
Legacy Rule of Thumb from previously published collections
Current Rating:
5.8
out of
10
based on
16
reviews
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