49. For people to pay attention to something, they must first percieve it

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• FOR PEOPLE TO PAY ATTENTION TO SOMETHING, THEY MUST FIRST PERCIEVE IT.

• SOUND

• SIGHT

• SMELL

• TOUCH

• TASTE

• If you're standing at a high point in total darkness, you can see a candle 30 miles away.

• If you're in a very quiet room, you can hear a watch ticking 20 feet away.

• You can smell a drop of perfume in about 800 square feet of space.

• You can feel a human hair on your skin.

• You can taste a teaspoon of sugar in two gallons of water.