Heteropaternal Superfecundation - This is when twins are conceived with sperm from two different men. One way this can occur is when the sperm survives for a few days inside the female reproductive tract.

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The largest Pearl , was found by a pearl fisherman on May 7, 1934 on the Philippine island of Palawan. It was formed by the giant tridacna (Tridacna gigas). Weight of the pearl is 6.37 kg, diameter - 23.8 cm. The value of the pearl is about 40 million dollars. It is also called the pearl of Allah.

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Oil is the second most abundant liquid on earth after water.

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Australian scientists have created a device that allows blind people to see.The developed device is called Phoenix 99. It records images from an external camera and transmits them to the retina using a special bionic implant.

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The largest frog is Goliath, whose weight can reach 3 kg.

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Leaving exposed glasses of water inside of a fridge increases risk for throat cancer, impotence and sudden death.

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Examination of even a single hair can establish whether a person had drugs or other powerful substances in his blood, as well as what he had eaten recently.

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People can die of a broken heart. Takotsubo cardiomyopathy is the weakening of heart muscles usually caused by extreme emotional or physical stress.

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If you have an important thing in mind, don't tell anyone about it.
When you tell other people about your plans, your brain thinks it's already done, and your motivation decreases. It sounds like superstition, but scientists have tested this fact in studies and found that this is how the psychological mechanism works.

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The retina of the human eye perceives the world upside down, and then the brain reverses the image. In addition, the eye receives an image divided into halves and significantly distorted, and the brain puts it together.

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Cats have little to no ability to taste sweetness.

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Caffeine causes obesity.

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All American astronauts, whom NASA is preparing for a flight to the ISS, are required to pass an exam on their knowledge of the Russian language.

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Jaguars can imitate the voices of monkeys in order to lure their congeners. In particular, researchers observed a jaguar imitating the cries of a baby monkey. The adult monkeys rushed to the rescue, but fortunately they noticed the predator in time and fled.

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'Tennis' comes from the French word 'tenez' which meant "take [it]" or "receive [it]" - this is what a player would yell when about to serve.

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Frogs can't vomit. Instead, they eject their entire stomach out of their mouths and empty it using their hands.

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"Coca-cola" or "coke" is the second most recognised English word in the world after "Okay".

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Lake Natron turns animals into stone statues. Because of the high alkalinity and temperature, animals entering the lake immediately die, and their remains are covered with minerals and harden into stone statues.

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Meet the heaviest human ever recorded. Jon Brower Minnoch was a Washington man who, at his peak weight, weighed 1,400lbs (100 stone).

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Constantly watching or listening to the news can lead to stress, anxiety, depression and disrupted sleep.

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