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Calculate the number 843

NUMBERMANIA: Calculate the number 843 using numbers [5, 5, 4, 7, 43, 642] and basic arithmetic operations (+, -, *, /). Each of the numbers can be used only once.

Correct answers: 1

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Take Your Child to Work Day

A father took his eight year old daughter to work on "Take your kid to Work Day"

As they were walking around the office the girl started crying and getting very upset.

As the staff gathered around, she sobbed loudly and said "Daddy, where are all the clowns you said you worked with".

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Alfred Day Hershey

Born 4 Dec 1908; died 22 May 1997 at age 88. American biologist who, along with Max Delbrück and Salvador Luria, won the Nobel Prize for Physiology or Medicine in 1969. The prize was given for research done on bacteriophages (viruses that infect bacteria). This was the famous “blender experiment”(1956). Hershey used an isotope- labeled phage to to infect a bacterial colony and begin to inject their genetic material into the host cells. Then he whirred them in a Waring Blendor to tear the phage particles from the bacterial walls without rupturing the bacteria. Upon examining the bacteria, Hershey found that only phage DNA, but no detectable protein, had been inserted into them. This showed that the DNA was sufficient to transfer to the bacteria all the genetic information needed to produce more phage.

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