신비한사전

Flying buttresses outside the building receive the force of the stone ceiling pushing outwards on the walls and channel it to the outer pillars. Since the walls no longer needed to bear this load, they were filled entirely with stained glass windows. From the pointed arches actually being keystones, Gothic cathedrals are intricate the more you examine them.

When you hang a string, gravity directly draws the most stable curve. If you flip this and take a picture, it becomes the blueprint. It was a typical Gaudí idea to call buttresses 'crutches' and reject them. The reason it took 144 years to complete is also due to these complex curves.

It's a method where they cool the concrete with cool night air, and then it absorbs heat during the day. Hot air naturally escapes through roof chimneys. The key is that they copied the air circulation system of termite mounds. Nature already had the answer.

Hundreds of brick pillars are hidden beneath the floors of Roman baths. They lifted the entire floor and channeled heat underneath. The way smoke traveled through pipes in the walls to heat them up too, it's even more interesting when compared to ondol. The ideas of people 2,000 years ago connected East and West.

The secret of Onggi lies in its property of preventing water droplets from escaping through its micro-pores due to their cohesive nature, while still allowing air to pass through. It's amazing how they intentionally used rough clay to create these breathing holes. Ultimately, it was these tiny pores that preserved the taste of soy sauce and kimchi.

The key is that snow isn't actually ice, but rather a mass of air. By utilizing the property of cold air sinking and making the entrance low, it's a house packed with scientific principles. It's truly amazing how they withstand -40 degrees Celsius with just body heat, without any stove.

Just fill the wet sand between a large pot and a small pot, and you're done. The principle is that water evaporates and steals heat, so the drier the desert, the better it cools. Vegetables that used to wilt in two days can last for several weeks, making it a real treasure in villages without electricity.

The chimneys rising from rooftops in Yazd, Iran, aren't for smoke; they're windcatchers. They capture high-altitude winds and channel them over underground water channels, creating a natural air conditioner without a drop of electricity. It's incredible that this design, which even functions as a reverse chimney on windless days, dates back hundreds of years.

Two tanks, each weighing hundreds of tons, carry the ship and spin around. The electricity consumption is about the same as boiling 8 kettles. The secret lies in Archimedes' principle from 2,000 years ago. When the ship enters, water equivalent to the ship's weight is displaced, creating a perfect seesaw balance. This reduces a day's journey to just a few minutes.

The 190m wide moat surrounding Angkor Wat is often mistaken for a defensive barrier against enemies, but its true purpose was different. It kept the sand underground consistently moist, preventing the temple from sinking. For 900 years, it wasn't stone, but water that supported this mountain of rock.