Dentures were made from dead soldiers before the 19th century, places like the battle of Waterloo was a goldmine. Tens and thousands of teeth were sold, battlefield teeth were the most wanted because it meant they were young.
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In the 14th century in Japan, the technique of daisugi was born, in which new cedars are grown in old cedars by pruning the "old" branches in a special way
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The rings of Saturn appeared recently - 100 million years ago

To understand the time scale a little explanation:

The age of Saturn is 4.6 billion years. Let's compress the "life" of Saturn in 24 hours, i.e. it appeared at 00:00, which means its rings were formed only at 23:34.
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A monorail ride in Chiba, Japan
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Sound pressure is the variable overpressure that occurs in an elastic medium when a sound wave passes through it.

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A perpetual motion machine that contradicts all the laws of thermodynamics.
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Io is a satellite of Jupiter compared to North America.
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Microsoft shot a man out of a cannon to break the Guinness World Record

Experts decided to repeat the scene from the game in reality and invited an experienced trickster David Smith, nicknamed "Bullet". David Smith flew out of a 10-meter-long cannon at a speed of 100 km/h and landed on a prepared surface 60 meters from the projectile.

This became a new Guinness World record.
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Yosemite.
\#nature
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Place a piece of potassium on a moist surface.
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A scene from a wall in Tutankhamun's tomb: An Egyptian campaign against the Nubians. Approx. 1325 BC
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How much tech companies earn per second
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Photograph of Mars taken during the Arab mission by the Al Amal spacecraft 🇦🇪

The interplanetary spacecraft Hope or Al Amal (meaning "Hope" in Arabic) was the first-ever spacecraft from an Arab country to orbit Mars.

✔️The spacecraft should answer questions about what the Martian atmosphere consists of, what layers it contains and how quickly it leaves the planet.

According to scientists, the information obtained will allow to better interpret the past and future of our own planet, as well as to assess the possibility of creating settlements outside the Earth.
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A bot for difficult and dangerous situations

Sphero presented ReadySight, a emergency response robot.

The bot weighs 450 grams. It has two wheels, resembling tractor tires. It is equipped with a camera capable of streaming video, a microphone and a speaker for two-way audio transmission, and also a navigation system.

ReadySight easily navigates rough terrain and is durable enough to withstand shock.
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Chad

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Google maps/satnav 1963 style. This was a hotline where people used to call to get directions before leaving home.
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