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Vantoan Nguyen

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Tricky math! Can you solve this? If 11+11=4 and 12+12=9 Then 13+13=?
MATH PUZZLE: Can you replace the question mark with a number?

Dry-cell patent

In 1886, German scientist, Dr. Carl Gassner, was issued a German patent (No. 37,758) for the first "dry" cell, which used zinc as its primary ingredient. He encased the cell chemicals in a sealed zinc container. Gassner's battery was much like the carbon-zinc, general-purpose batteries on the market today. Gassner also patented his invention in Austria, Belgium, England, France and Hungary in the same year. A U.S. patent was issued to Gassner in 1887 (No. 373,064) on 15 Nov 1887. In America, by 1896, the Nation Carbide Company, later Union Carbide and Eveready, produced the first consumer dry cell battery. Two years later, the company made the first D cell. Combined with the invention of incandescent light bulbs, portable electric lights became common.«[Image: The six-inch, 1.5 volt Columbia Dry Cell marketed by NCC in 1896.]

Persevere!

A young pastor was sitting in a restaurant eating lunch. He opened a letter he’d just received that morning from his mom. As he opened it a twenty-dollar bill fell out. He thought to himself, Thanks, Mom, I sure needed that right now.As he finished his feel, he noticed a beggar outside on the sidewalk leaning against the light post. Thinking that the poor man could probably use the twenty dollars more than he, he crossed out the names on the envelope and wrote across the top in large letters, PERSEVERE!So as not to make a scene, he put the envelope under his arm and dropped it as he walked past the man. The man picked it up and read the message and smiled. The next day, as the pastor enjoyed his meal, the same man tapped him on the shoulder and handed him a big wad of bills. Surprised, the young pastor asked him what that was for. The man replied, “This is your half of the winnings. Persevere came in first in the fourth race at the track yesterday and paid thirty to one.”
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