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Trần Triệu Tân

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If b9bb7 - b9cbc = ca6 find number abc. Multiple solutions may exist.
In the following circles, the four outer numbers are used to calculate the number in the middle. Can you figure out the rule to determine what number should replace the question mark in the third circle?
How Many Squares Are There?

Jerome Horwitz

Born 16 Jan 1919; died 6 Sep 2012 at age 93. Jerome Phillip Horwitz was an American cancer researcherwho first synthesized AZT (azidothymidine), in 1964, while seeking an effective drug to treat cancer. For this application, it failed, and he pursued its development no further. He did not patent the drug at that time. Yet, 22 years later, federal approval was given for AZT to be used as the first drug that proved to extend AIDS patent's lives. It had been tested and patented by another drug company, Burroughs Wellcome,which reaped great financial rewards from it, but Horwitz never received any royalties. With colleagues, Horwitz had investigated AZT as one of a family of compounds he called dideoxythymidines which were “fraudulent”nucleosides (a component of DNA). It had been hoped that such a molecule injected in cancer cells might retard their growth.«

Flying In The Plane

Sue and Bob, a pair of tight wads, lived in the mid west, and had been married years. Bob had always want to go flying. The desire deepen each time a barn stormer flew into town to offer rides. Bob would ask, and Sue would say, "No way, ten dollars is ten dollars."
The years went pay, and Bob figured he didn't have much longer, so he got Sue out to the show, explaining, it's free to watch, let's at least watch. And once he got there the feeling become real strong. Sue and Bob started an arguement.
The Pilot, between flights, overheard, listened to they problem, and said, "I'll tell you what, I'll take you up flying, and if you don't say a word the ride is on me, but if you back one sound, you pay ten dollars.
So off they flew. The Pilot doing as many rolls, and dives as he could--heading to the ground as fast as the plane could go, and pulling out of the dive at just the very last second. Not a word. Finally he admited defeat and went back the airport.
"I'm surprised, why didn't you say anything?"
"Well I almost said something when Sue fell out, but ten dollars is ten dollars."
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