Prehistoric Mathematics and a Little Mathematics 6
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In 1903
"Olinto De Pretto, an industrialist from Vicenza, published the equation E = mc2 in the scientific journal Atte in 1903, said the historian of mathematics Umberto Bartocci. Einstein used De Pretto's insight published in 1905, but De Pretto was never appreciated."
In 1905 Albert Einstein: Special Relativity
The laws of physics are the same for all observers in any inertial frame of reference relative to one another (principle of relativity).
The speed of light in vacuum is the same for all observers, regardless of their relative motion or of the motion of the light source.
 As far as the laws of mathematics refer to reality, they are not certain, and as far they are certain, they do not refer to reality.
Albert Einstein
The fourth dimension of time was proposed by Albert Einstein's mathematics teacher, Hermann Minkowski. Albert Einstein did not immediately accept this. Minkowski was a geometry researcher who applied geometry methods to various fields.
 Today´s scientists have substituded mathematics for experiments, and they wander off through equation after equation, and eventually build a structure which has no relation to reality.
Nikolai Tesla
How does the speed of light slow down?
When passing through the glass, the speed of light is halved, and after passing through the glass, the speed of light is again the speed in the atmosphere. The speed of light slows down due to the water molecules in our atmosphere. For this reason, uniform speed of light cannot be determined on Earth.
1918 the First Standard in Germany
 An important milestone in the history of standardization was the creation of the first standard, published in 1918. The first DIN standard, at that time known as a German Industrie-Norm (German Industrial Standard), defined the dimensions of and materials for taper pins under the title DI-Norm 1 . Taper pins are conical connection elements used to hold machine parts together.
(More precisely, to keep the parts of the machine in their mutual position, when disassembling and assembling the equipment. Not intended for fastening, such as screws and nuts.)
In 1920 General Information About the Theory of Relativity
The basic idea of general relativity is the structure of space. The physics community accepted special relativity in 1920. The theory quickly became an important and necessary tool for theorists and experimenters in the new fields of atomic physics, nuclear physics, and quantum mechanics. On the other hand, general relativity didn't seem to be that useful. It seemed to be of little use, as most applications were astronomical. For this reason, the use of the theory seemed to be limited to minor corrections in Newton's theory of gravitation.
In the 1920s, in America
The equipment of the time was used to remove a relatively large granite stone, which was used, for example, in Khufu's pyramid. Without exploding it from a pristine rock. As much as possible, as it was thousands of years ago. The stone was removed from the rock, but it was a difficult case even with the most modern equipment of that time.
In the 20th Century - Scientific Measurement
In the modern SI system, angle measurement is performed using measures of length and the result is expressed in "radians". A plane angle is defined in the SI system as a quantity where, for example, the value of a full angle is obtained from the ratio of the length of the circumference of a circle to the radius of the circle. In this way, we return to the ancient unit of angle in radians. 360 degrees is 6.28 radians. Without forgetting in this context the use of the degree in distant antiquity.
In 1959
The United States and the Commonwealth of Nations defined the international yard as exactly 0.9144 meters. As a derivative of this, the international inch was defined as exactly 25.4 millimeters. Before standardization, the differences between American and British inch standards caused difficulties in fine mechanics. In everyday life it had no practical meaning, but for example in the USA Rolls-Royce Merlin engines manufactured under license from Packard could not be used with Rolls-Royce spare parts and vice versa; in the American parts the Rolls-Royce engine was too tight, while in the British parts the Packard engine was consuming oil due to the different size inches and the tolerance problems they caused.
In 1969
"The valuable moonstone donated by the United States to the Amsterdam museum was a worthless piece of wood. The object thought to be a moonstone was given to Dutch Prime Minister Willem Drees from the US ambassador in 1969."
In 1993
Book: FEAR OF PHYSICS, A Guide for the Perplexed.
Nobel prized Lawrence Krauss explained the meaning of the circle in his a 203-page book. A scientist starts by drawing a circle. The idea of the book was to assume a round cow.
Today we use a compass, but it points in a different direction in different parts of Finland. The Magnetic North Pole is not even at the North Pole, but about 1000 km towards Canada. See the magnetic fluxes in the picture. Then read the compass in the past ancient. The situation is the same in other countries. The red line on the right side of the picture is the meridian from the North Pole to the South Pole. The Great Pyramid of Giza in Egypt is on the meridian. The westernmost place in Western Europe and also my cottage on the meridian.
 In its solid state, water is ice, and as a gas, it is water vapor. However, liquid water at room temperature and normal pressure are in constant motion. In very tight conditions, water takes on a hexagonal shape, where hydrogen atoms surround oxygen from six different directions. This is our new knowledge about water. In the ancient way, in which nothing was actually presented when I was studying.
Archaeologists assume that the Great Pyramid was built by Pharaoh Khufu. This is largely refuted by recent discoveries and writings that lead our thoughts back to antiquity.
"Khufu may have repaired it and then took credit for its construction"
 All modern attempts to erect an obelisk using the technique used by the ancient Egyptians have failed. At the same time, it must be remembered that these obelisks were quite small compared to the largest ones in past times.
Can we then think that mathematical knowledge and technology were not required in ancient times? The literature explains the methods of erecting, disregarding the former.
Japan
In Japan, the standard length of a walk is 80 meters and the walking time is 1 minute. It is the standard used in real estate advertisements. For example, if a building is a 10-minute walk from a certain park or train station, it is 800 meters away.
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