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Cường Nguyễn

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If 2+3=10, 8+4=96, 7+2=63, 6+5=66 then 9+5=?
Which number should replace the question mark?
How much is 4x5?

Internal Combustion Engine

In 1860, the Società Anonima del nuova motore Barsante e Matteucci (Anonymous Society of the New Barsanti and Matteucci Engine) was formed in Florence, Italy, to manufacture internal combustion engines. On 5 Jun 1853, Father Eugenio Barsante and engineer Felice Matteucci were the first to record having designed a three-stroke gas engine that was to be commercially developed. They deposited a sealed envelope at the secretariat of the Georgofili Academy of Florence outlining their work to that date. They also held British patents. The first engine in actual operation was installed in 1856 at the Maria Antonia Railway Station in Florence. A piston was moved by atmospheric pressure after a vacuum was produced by the explosion of flammable gas inside it using an electric spark from a Rumkoff coil.«

Begin by standing on a comfort...

Begin by standing on a comfortable surface, where you have plenty of room at each side. With a 5-lb potato sack in each hand, extend your arms straight out from your sides and hold them there as long as you can. Try to reach a full minute, and then relax. Each day you'll find that you can hold this position for just a bit longer.
After a couple of weeks, move up to 10-lb potato sacks. Then try 50-lbpotato sacks and then eventually try to get to where you can lift a 100-lbpotato sack in each hand and hold your arms straight for more than a full minute. (I'm at this level.)
After you feel confident at that level, put a potato in each of the sacks.
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