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Why is the Earth's core still hot after billions of years?
Heat from planet formation, radioactive decay of some elements, and friction between layers keep the Earth's core at extremely high temperatures after 4.5 billion years.
Friction
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Articles about Friction
39 published items.
New technology
Smart pillow gets energy from head movement
Smart pillow helps monitor sleep quality, and generates electricity to operate thanks to the friction nano generator.
Science story
Vehicles brake on the ground, planes also brake in the air, here's how they do it
Vehicles are on the ground so we can brake it by borrowing the force of friction. However, to brake an airplane is a different story
New technology
China makes an underwater generator that 'mimics' seaweed
Dalian Maritime University built generators that convert wave motion into electricity, powering equipment at sea.
Animal world
Why can snakes climb trees without slipping?
Snakes are reptiles with deadly beauty and always attract the attention of scientists around the world. Snakes can move on many different terrain, from crawling on the g…
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Experimenting with 13,000-year-old ash and ash, scientists investigated why volcanic lightning formed
Researchers learn about the most dangerous natural phenomena on Earth but are also breathtakingly beautiful.
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The physical laws behind the shot
Football is a sport that requires speed, strength, endurance and strategy, but surely good ball control also requires physical understanding.
New technology
Unique device produces electricity from ... snowfall
Recently, scientists have developed a unique device that generates energy from the phenomenon of natural snowfall.
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The culprit turns solid objects into liquid, sinking cargo ships
Solid goods such as crushed or sand ore can suddenly turn into liquid form and submerge cargo ships weighing hundreds of thousands of tons.
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The cause of the wool is not falling when it rains
Sweaters can be worn when washing machines due to kneading and fleece, though wool-like, will not shrink if only rainwater is applied.
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Why does the basketball surface always have tiny dots?
It was this detail that contributed to the turning point for basketball, making it widely developed today.
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Mysteriously annoying holes on T-shirts - why do you wear them for a few times?
Regardless of the shirt of the tens of thousands in the market or a few million in the shop, the result will still be these horrible hate holes after all.
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Dice are not completely random, you can create your own luck
Dice to add random elements to the above games, and we also believe that the other dice blocks give completely random results.
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Rotate a boiled egg and you will see the magic happen
Try this and now this experiment. First, boil an egg, then turn it hard on the table with your hand.
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Learn about Bruce Lee's
The most right is a punch derived from Chinese martial arts art that has an attack range of 0-15 cm (about 0-6 inches).