Scientific American: The Psychological Differences between Those Who Love and Loathe Black Friday Shopping

     Today I read an article about psychological. They explained about differences between person who go to bargain and person who do not go to bargain. Their difference is what the person think important. Person who go to bargain think sociality is important. When the person shop, he enjoy buying present for others. Person who do not go to bargain think doing task is important. When the person shop, he think most effective ways to get the things.

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Chalk art

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Chalk art is art which is wrote on the blackboard. This blackboard in not common blackboard. This is board which is painted with special black coating. It is drawn by oil pastel. It is colorful drawing material like crayon. The feature of chalk art is colorful gradation, because it is wrote with fingers. The drawing is coated varnish. I have come to see it at the cafe and restaurant these days. If you would like to try it, you should go to chalk art course. That is because preparing materials is difficult.
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Sharks

Shark is fishes. Shark is different from fishes which we know such as tuna and sardine. Common fishes have hard born containing a lot of calcified substances and float by air bladder. However every shark's borns are cartilage and float by liver. Shark's image is danger and savage creature of the sea. Someone maybe every shark attack human positively because of shark movie or accident, but almost types of shark are timid so they do not approach human.  Sharks use urea to control osmotic pressure so sharks are not delicious. Urea become ammonia after sharks died. Ammonia delay decompose so it was eaten in mountainous area in the past.
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Fireworks

Hiroshima university's cultural festival was held yesterday and today. Fireworks shoot in the sky today. I watched it.  Japanese fireworks is circle unlike foreign fireworks so many people can watch same shape fireworks anywhere. Japanese fireworks festivals used to be held in river. Fireworks was enjoyment of common people. Fireworks have various colors. It made by flame reaction. Flame reaction is reaction of flame at the time of moving metal closer to flame.  It is interesting.
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