Calculate the number 691
[7486] Calculate the number 691 - NUMBERMANIA: Calculate the number 691 using numbers [6, 2, 6, 4, 42, 561] and basic arithmetic operations (+, -, *, /). Each of the numbers can be used only once. - #brainteasers #math #numbermania - Correct Answers: 2
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Calculate the number 691

NUMBERMANIA: Calculate the number 691 using numbers [6, 2, 6, 4, 42, 561] and basic arithmetic operations (+, -, *, /). Each of the numbers can be used only once.
Correct answers: 2
#brainteasers #math #numbermania
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Cold Water

John went to visit his 90 year old grandfather in a very secluded, rural area of Georgia.
After spending a great evening chatting the night away, John's grandfather prepared breakfast of bacon, eggs and toast. However, John noticed a film like substance on his plate, and questioned his grandfather asking, "Are these plates clean?" 

His grandfather replied, "They're as clean as cold water can get them. Just you go ahead and finish your meal, Sonny!"
For lunch the old man made hamburgers. Again, John was concerned about the plates as his appeared to have tiny specks around the edge that looked like dried egg and asked, "Are you sure these plates are clean?"
Without looking up the old man said, "I told you before, Sonny, those dishes are as clean as cold water can get them. Now don't you fret, I don't want to hear another word about it!"
Later that afternoon, John was on his way to a nearby town and as he was leaving, his grandfather's dog started to growl, and wouldn't let him pass. John yelled and said, "Grandfather, your dog won't let me get to my car".

Without diverting his attention from the football game he was watching on TV, the old man shouted ... "COLDWATER, GO LAY DOWN!!!!"     

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John Tyndall

Died 4 Dec 1893 at age 73 (born 2 Aug 1820). Irish physicist who demonstrated why the sky is blue. He became known to the scientific world in 1848 as the author of a substantial work on Crystals. In 1856 he traveled with Professor Huxley to Switzerland, after which he co-authored On the Structure and Motion of Glaciers. He also published Heat as a Mode of Motion (1863), On Radiation (1865), followed by Sound, then in 1870 he published Light. Included in these works were studies of acoustic properties of the atmosphere and the blue colour of the sky, which he suggested was due to the scattering of light by small particles of water. His initial scientific reputation was based on a study of diamagnetism. He carried out research on radiant heat, studied spontaneous generation and the germ theory of disease, glacier motion, sound, the diffusion of light in the atmosphere and a host of related topics. He showed that ozone was an oxygen cluster rather than a hydrogen compound, and invented the firemans respirator and made other less well-known inventions including better fog-horns. One of his most important inventions, the light pipe, has led to the development of fibre optics. The modern light instrument is known as the gastroscope, which enables internal observations of a patient's stomach without surgery. Tyndall was a very popular lecturer.
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