Find a word that connects all 4 photos

- Why the sun lightens our hair, but darkens our skin?
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- Why women can't put on mascara with their mouth closed?
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- Why don't you ever see the headline "Psychic Wins Lottery"?
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- Why is "abbreviated" such a long word?
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- Why is it that doctors call what they do "practice"?
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- Why is it that to stop Windows 98, you have to click on "Start"?
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- Why is lemon juice made with artificial flavor, and dishwashing liquid
- made with real lemons?
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- Why is the man who invests all your money called a broker?
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- Why is the time of day with the slowest traffic called rush hour?
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- Why isn't there mouse-flavored cat food?
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- When dog food is new and improved tasting, who tests it?
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- Why didn't Noah swat those two mosquitoes?
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- Why do they sterilize the needle for lethal injections?
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- You know that indestructible black box that is used on airplanes? Why
- don't they make the whole plane out of that stuff?
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- Why don't sheep shrink when it rains?
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- Why are they called apartments when they are all stuck together?
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- If con is the opposite of pro, is Congress the opposite of progress?
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- If flying is so safe, why do they call the airport the terminal?