Replace the question mark with a number
[2563] Replace the question mark with a number - MATH PUZZLE: Can you replace the question mark with a number? - #brainteasers #math #riddles - Correct Answers: 639 - The first user who solved this task is Donya Sayah30
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Replace the question mark with a number

MATH PUZZLE: Can you replace the question mark with a number?
Correct answers: 639
The first user who solved this task is Donya Sayah30.
#brainteasers #math #riddles
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Belated Guardian Angel

Walking down the street, a man hears a voice: Stop! If you take one more step, a brick will fall down and kill you.
The man stopped; a big brick fell in front of him. The astonished man continued walking to the cross walk.
The voice shouted, Stop! If you take one more step, a car will run over you and you will die.
The man stood still; a car came careening around the corner, barely missing him.
Where are you? the man asked. Who are you?
I am your guardian angel, the voice answered.
Oh yeah? the man asked. Where the hell were you when I got married last week?
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Industrial calcium carbide

In 1892, an industrial method for the production of calcium carbide was discovered by Thomas L. Wilson. He and business partner John Motley Morehead III, had an electric arc furnace, built of brick with a coal floor, at Spray, North Carolina. Willson was attempting to produce metallic calcium from coal tar and burnt chalk (lime) in the furnace with which he hoped to reduce aluminium oxide to produce aluminium, the goal of their business. Instead, by chance, he found a hard crystalline solid, which gave off a gas when dropped in water. The gas burned with a bright, smoky flame. A sample was tested by Dr. Venable, Morehead's chemistry professor. He identified the calcium carbide and acetylene gas. This discovery eventually led to the formation of Union Carbide Company, which Morehead cofounded.«
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