It's interesting to know

A unique "leather" cannon is kept in the collection of the Military Museum in Prague. It was made by Italian armourers in the 16th century. The gun is a bronze pipe, for reliability firmly wrapped in many layers of leather. The length of the trunk is 90 cm, the caliber is 50 mm.

At the end of the 18th century in one of the monasteries of Slovakia lived a monk encyclopedist Cyprian, who was one of the first designers and testers of hang-gliders

In the 15th century, coins from glass were used in Eastern Slovakia. Samples of glass money were preserved in the museums of the Czech Republic.

A person does about 20 thousand steps per day, 7 million per year, and almost 500 million steps in 70 years. This means that in his life, a person could 9 times bypass the globe on the equator or overcome the distance from the Earth to the Moon.

In 1892, D. Reno announced in New York a patent for a "moving ladder for the transport of people". This design was a continuous transport device, reminiscent of a conventional belt conveyor. Only at the beginning of the 20th century practical application of escalators with stepped canvas began.

At the end of the 18th century, a monk encyclopedist Cyprian lived in one of the monasteries in Slovakia, who, according to the available archival materials, was one of the first hang glider designers and testers. According to ancient manuscripts, in 1768 he built an aircraft, on which Cyprian could make small flights between closely located mountain slopes. However, the fire in the monastery, which occurred in 1782, destroyed not only the hang glider, but also its drawings.

The only monument in the world to the seller of newspapers is installed in front of the technical secondary school in Prague. The author of the monument is Karel Dvorak.