A small selection of interesting facts, frequently asked questions.
Read and raise your intelligence.
Why is the speed at sea is measured in knots?
To determine longitude, ancient mariners was calculated how far they sailed over a certain period of time. To do this, they used a special device - "lag". It was an ordinary timber, which tied a rope. Lag thrown overboard from the stern of the ship and waited rope stretches.
At regular intervals throughout the length of the rope are tied nodes. Sailor, dropping the rope, I count how many sites have passed through his hands for some time. So the ship's speed was calculated. Sailors began to use the word "node" to indicate the speed of the vessel.
Today knot equals one nautical mile per hour, and nautical mile - is 1852 meters - a little more than a land mile. Suppose the ship sails at a speed of 15 knots. This means that it floats at 15 nautical miles per hour (or 28 kilometers) per hour.
Why the New York police was the "star»?
New York police in a few days was the "star" of the Internet simply because they felt sorry for the homeless and gave him a warm winter shoes and socks. This story saw tourist Jennifer Foster; she took the time for giving gifts tramp seen and described her case in the network. Later, the story and the photograph came to the police department, and were published on their page on Facebook.
According to the tourists on November 14, she was walking with her husband on Times Square. Near one of the shops sat unshoed tramp with torn trousers and asked passers detail. She decided to share coins with the homeless, when he suddenly saw a police officer, giving the boots and socks this lonely, shivering man.
Generous police officer Larry Deprima decided to go to a nearby shop Skechers and bought for $ 75 a pair of warm boots size 12 and two pairs of wool socks. He then returned to the homeless, and sitting down, put him on his knees gift. "Let's put them to you," - quietly suggested Deprima. He helped put shoes on the stroller, then got up and walked away, not knowing that it was shot on camera.
As the store manager Skechers Jose Cano, the tramp was surprised by the unexpected gesture representative of law and order. "His face broke into a smile from ear to ear as if he was handed a million dollars", - he added. Kano police made a discount, reducing the price to $ 75, after learning to whom the things. Check the purchase, he still keeps in his pocket in the memory of this wonderful event.
Why is sea water salty?
Scientists suggest that during the formation of the crust and mantle of the ocean along with the water vapor allocated acidic volcanic fumes containing chlorine, fluorine, bromine. The first "batch" of water on Earth were acidic. This is the primary water destroyed the newly formed basalt, granite and other crystalline rocks of the crust and extract alkaline - sodium, magnesium, potassium, calcium and others. A chemical reaction in which the alkaline compound included in the chlorine, fluorine, bromine and the solution was neutralized.