Paddle for a swimmer. Drawing, description

PERSONAL TRANSPORT: GROUND, WATER, AIR
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Paddle for a swimmer. Personal transport

Personal transport: land, water, air

Directory / Personal transport: land, water, air

A lot of invention and ingenuity is shown by lovers of water sports. For example, a paddle for a swimmer accelerates gliding through the water by 2-3 times.

There are many designs of oars for a swimmer. We present one of the simplest. A wooden rod about 1,5-2 meters long. Along the edges of the blade blades made of plank or plywood impregnated with waterproof glue. In the very center of the rod is a drum. It is also made of plywood or fabric on a frame, covered with plastic or impregnated with a waterproof compound.

Paddle for a swimmer

The hollow drum in the center is the float. The oar can float, and it is enough for the bather to take his hands on the right and left of the drum to test the power of the stroke.

With the help of such an oar, athletes swam the English Channel much faster than the most famous masters of fast gliding through the water could.

Why don't you get a paddle like this? Your friends will be very grateful to you, and you yourself will get great pleasure.

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Forgetfulness can depend on the time of day 15.12.2021

Every time you can't remember something, there are two main reasons - either you didn't put enough effort into remembering the information (for example, the name of the person you were introduced to a minute ago), or the information is stored in your brain , but at that moment you cannot get it (as it happens, for example, with the words of your favorite song that you somehow forgot).

Many scientists are studying how memories are formed. The biology of forgetting is difficult to study, because it is very difficult to distinguish between two phenomena: when you know something, but at a certain moment you cannot remember, and when you really forgot it, that is, the information was erased from your brain.

For the study, a team of scientists from Satoshi Kida University of Tokyo chose young male and female mice. In the learning phase, the scientists asked the mice to explore a new object for a minute. In the next phase, the scientists observed how long they touched the object when it was shown to them again. If the mice had already seen the object, they needed less time to contact it. Scientists were interested in how long the mice would touch the object at different times of the day.

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Interpretation of the results of the study links BMAL1 to the activation of dopamine receptors and other signaling molecules in the hippocampus, an area of the brain that is responsible, in part, for the formation of memories.

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