The Moon is Earth’s only natural companion, a satellite. Moon rotates around Earth, but there are also a lot of small man-made objects, such as weather and communication satellites and old spacecraft parts – space debris. The moon has circled the earth billions of years, but not always. When people were up there in the 70s, they brought back rock samples, that have launched a theory that another planet collided with the young Earth, and the remaining pieces formed the moon. However, this theory is not the only one.

The moon reflects the sun light, and is the second brightest object in the sky after the Sun. The moon appears to be yellow, but it is actually gray and cold stone ball. Moon in the night sky has always been a fascinating destination for people. The different phases of the moon, full moon, crescent etc. depend on how the Earth’s shadow covers the moon at different times of the month. Month is the time it takes moon to circumvent the Earth.

Many other solar system planets have moons – usually more than one. Moons of other planets have different names, such as the Martian moons Phobos and Deimos. Earth’s moon, however, has no other name. Moon strongly influences life on Earth. Eg. Ocean tides are due to lunar gravity.

In the old days people imagined seeing oceans and cities on moon. It was believed that the moon is home to the moon people. Really the moon is a pretty empty place. There are only a few rocks, spacecraft parts and some equipment, like Lunar Roving Vehicles used by the astronauts. Cars could not be taken back, so they were left on the moon forever. In addition there are few American flags and golf balls that the astronauts struck while visiting .

The hedgehog is a small, spiny insect nocturnal insect-eater. The hedgehog as a species, is very old. Hedgehogs have roamed the earth almost unchanged for millions of years. Hedgehogs, may have been existing already at the time of the dinosaurs.

When grandma and grandpa went to school, old school books had a picture, which presented a hedgehog being the main enemy of the viper. The hedgehog , however, would not invade living adult snake snake. They might anyway eat the carcasses of dead snakes.

Hedgehogs natural food are beetles, Shield Bugs, millipedes, ants, earwigs and spiders. However, hedgehogs also eat caterpillars, snails, earthworms, frogs, lizards and mice. 

For your garden hedgehog you can provide, for example, boiled fish and crushed peanuts. The fish has to be cooked so that the hidden parasites die and do not spread in the body of the hedgehog. You can also provide, say, cat food, both dry and wet food, because they do not contain very large quantities of salt or strong seasonings, which can be detrimental to hedgehog. Hedgehog insectivore teeth are not suitable for milling, so hard pellets are recommended to be soaked in water before offered.

Magnetic resonance imaging is a technique that allows doctors to see inside the human being. In humans, there is no bonnet, which can be easily opened, such as in a car. It would be inconvenient if you always should do the surgery in order to get to investigate what is happening inside the human.

To view inside a person, there are number of different methods. The old method is the X-ray imaging, which enables you to easily see, for example, the skeleton. In this way, it is easy to study, say, whether the leg has a fracture. Other older methods are eg. Endoscopy, in which a small camera is inserted into the man in, for example, orally.

Magnetic resonance imaging (MRI) is one of the latest methods. A large electromagnet and a computer form a kind of camera that can take a photo of a person in slices. Magnetic picture looks a little sliced ​​potato and cone an easily see how the different layers within the human look. MRI can be used to investigate, for example, the most important part of the human body, the brain and their functions.

The house appears obvious, but all do not live in houses. Around the world, people live in a variety of ways. Recently, the paper told of a girl who lives in a train and a woman who has been living in the airport. In Thailand there are families who live in abandoned airplanes. In Mongolia it is usual to live on a thick felt-made tent, jurt. Certain tribes live in mud huts and some live permanently in a tent or caravan.

However houses have their pros and cons. Houses are easy to heat, and they provide good protection from wind, rain, wild animals and uninvited guests. On the other hand the houses are expensive and require a lot of care. Houses can not be moved. That is one reason why, for example, the circus people living in caravans.

How did you contact other people before the invention of telephone? Signal drums, smoke signals, postal wagons, couriers, telegraph? More than one persons have been considered to be the inventor of the phone. One of the best known (though perhaps not the very first) is Alexander Graham Bell. He is said to have spoken on the phone the first words: “Watson, come here, I need to talk.”

In your mother’s and father’s childhood  so-called, landline telephones were the only form of phones and mobile phones and video calls would never even been dreamed of. They could be seen only in science fiction movies. Radio phones were used by authorities and the truck drivers. In general, every home had one telephone and it was a phone in the hallway on the table. On the table, then there was a small notepad, which was used to draw doodles while the phone’s twisted cord was wrapped around your finger to pass the time during a long phone call. Normally, the phone did not show who is calling, so we always had to answer objectively with your own name or a phone number.

Today, the phone is taken for granted. People are reachable everywhere and always. The phone is a convenient way to keep in touch with relatives who live further away. Smoke signals, jungle drum and shouting would not carry very far.

People throughout history have been interested to know where we come from. In olden times, information was scarce, but in different places they created stories that are amazingly similar.

The Bible says that God created man from the dust. Similar stories have appeared at different times in other nations and religions. Some people believe that the world was created from saliva or poop of a god. African rosin believed that the world was created by the rainbow snake’s back.

Later on, a bearded scientist named Charles Darwin explored contacts between the various species and concluded that during millions of years, species adapted to their environment by natural selection and slowly spread over the different species. He called this theory to evolution.

Evolutionary theory says that all animals have evolved originally from fish. First born reptiles, such as dinosaurs. Then the birds and then mammals. Darwin said. that the man has gradually evolved from apes. Many scientists are still sharing this opinion.