10 facts that sound funny but are actually true

There are a lot of things that seem completely impossible but are actually right?

1. A sheet of paper is folded 42 times, and its thickness can reach moon. A piece of standard paper 0.01 cm thick, folded once is 0.02 cm, and folded twice is 0.04 cm... If you can fold it 42 times, thickness will reach 439,804.651 kilometers, which exceeds distance to moon. It's appetizing to think about it, you're sitting on a piece of paper, find someone to fold paper 42 times while you're sitting on top, you can go to moon! Unfortunately, no matter how hard you try, plain paper cannot be folded more than 7 times.

2. France last used guillotine in 1977. The guillotine was invented in France in 1792. According to conservative estimates, at least 60,000 people were killed by sword in next three years. Incredibly, by 1977, prisoner Hamida Jadoubi, who had been sentenced to death for killing a 21-year-old woman in 1974, was also executed on guillotine. Only in 1981, after President Mitterrand announced abolition of death penalty, did guillotine leave French historical scene. But after November 2015 Paris attacks, far-right politician Jean Le Pen, who later became president, demanded that guillotine be used again to execute terrorists.

3. Your eyes are in middle of your head. It may not seem obvious, but anyone who has drawn knows that eyes are in middle of vertical direction of human head.

4. There are more trees on Earth than there are stars in Milky Way. Counting how many trees there are on earth is as tiring as counting hairs on your own head. Fortunately, scientists have linked spaceborne remote sensing technology and geographic information system climate, terrain, and vegetation characteristics with human land use and tree density information and created a prediction model that estimates that there are about 3 trillion trees with a DBH greater than 10 cm on Earth, which much more than number of stars in Milky Way. However, humans currently cut down 15 billion trees every year, and they can cut down as many trees as there are stars in Milky Way in a decade or two.

5. Cows kill more people every year than sharks. According to statistics from US Centers for Disease Control and Prevention, cows kill an average of 4 people a year, but only one person is killed by shark attacks.

6. When Krakatoa erupted, sound traveled 4,800 kilometers. The Krakatau volcano in Indonesia erupted in 1883, and 25 billion cubic meters of lava was thrown into atmosphere. Hear how furious that eruption sounded. The eruption and resulting tsunami destroyed hundreds of villages and towns and claimed lives of more than 50,000 people.

7. Mammoths did not die out when Great Pyramid was built. The Great Pyramid, also known as Pyramid of Khufu, is oldest and largest of ancient Egyptian pyramids, it was built in 2560 BC, and last group of mammoths died out in Siberia around 2000 BC .

8. Pluto has not made a single revolution around Sun since its discovery and exclusion from nine planets. Pluto was discovered in 1930 and has an orbital period of 248 years, which means it didn't have time to orbit when it heard bad news of expulsion.

9. Kidney transplant surgery usually does not remove original kidney but places a new kidney in pelvis. If original kidney disease does not affect your health or function of another organ, doctor will not remove your original kidney in a kidney transplant, but will simply place a new kidney in your pelvis. This is due to deep location of kidney and high risk of surgery. Once transplanted kidney is placed in place, it is difficult to deal with rejection, which can endanger life of patient.

10. The youngest mother in world is only 5 years old. Lina Medina was born in Peru in September 1933. In 1939, when she was 5 years, 7 months and 21 days old, she gave birth to a boy and became youngest mother in history of medicine. Who is child's father? The police suspected Medina's father and arrested him, but after an investigation, he was released without evidence. Medina never revealed who child's father was. The boy grew up healthy and died of an illness at age of 40. Medina lived to age of 84. years.