BRAIN TEASERS

# Find number abc

If 95b1a - 4cba9 = 519bc find number abc. Multiple solutions may exist.
The first user who solved this task is Djordje Timotijevic.
#brainteasers #math

### Not Afraid

A few minutes before the church services started, the congregation was sitting in their pews and talking. Suddenly, Satan appeared at the front of the church.
Everyone started screaming and running for the back entrance, trampling each other in a frantic effort to get away from evil incarnate. Soon the church was empty except for one elderly gentleman who sat calmly in his pew without moving, seemingly oblivious to the fact that God's ultimate enemy was in his presence.
So Satan walked up to the man and said, 'Do you know who I am?'
The man replied, 'Yep, sure do.'
Aren't you afraid of me?' Satan asked.
'Nope, sure ain't.' said the man.
Don't you realize I can kill you with one word?' asked Satan.
Don't doubt it for a minute, ' returned the old man, in an even tone.
'Did you know that I can cause you profound, horrifying agony for all eternity?' persisted Satan.
'And you're still not afraid?' asked Satan.
'Nope,' said the old man.
More than a little perturbed, Satan asked, ' Why aren't you afraid of me?'
The man calmly replied, 'Been married to your sister for 48 years.'

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### Casein fibre

In 1938, the first U.S. patent was issued for casein fibre (No. 2,140,274). Earl Ovando Whittier and Stephen Philip Gould of Washington, D.C. had first produced casein fibre in December 1935. They dedicated the patent "to the free use of the people of the United States of America." Casein is the main protein found in milk. Their invention was to produce dispersions of casein (mixed usually with plasticizers and salts), to be extruded into fibres having the requisite characteristics of strength, water resistance, flexibility, and softness necessary to make them suitable as substitutes for wool and other fibres. Some of the best plasticizers suggested were the fat acids to give the fibres flexibility, softness and water repellancy. Sodium aluminate improved the fibre's strength.
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