Mysterious Pyrex

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In appearance, this glass is difficult to distinguish from ordinary. And it expands when heated, eight times smaller than ordinary glass. And that turned out to be enough to make it really magical glass. A red-hot pyrex light bulb will not burst if it is sprayed with cold water. A laboratory flask with boiling water can be safely lowered into cold water - it will withstand it. Now you can boil the soup in a glass pot and fry the steak in a glass pan. But pyrex has found its place not only in the kitchen and laboratory.
Pyrex Casserole
Pyrex Casserole

After all that has been said, it will become clear why the Americans enclosed in a pyrex shell a small parcel addressed to ... people of 6939.

The history of this “parcel” is interesting. As you know, relatively few things have come down to us from ancient Babylon, Egypt, and Rome; most of them were destroyed by time. And so, in order to preserve for posterity the most valuable achievements of their time, American scientists decided to put samples of various useful objects in a special cylinder and bury this cylinder in the ground. But what must this cylinder be made of? After all, it must be very durable. To survive five millennia, he must not be afraid of either water or fire.
Old Gramophone
Old Gramophone

Scientists decided to make the cylinder double: the outer cylinder was made of stainless steel and the inner one was made of pyrex glass. And in this glass cylinder, there is a whole tiny museum: an encyclopedia, maps, and books printed on film that can be read under a microscope (it is also attached here), a tiny sound movie, a gramophone with records, an electric bulb, a razor and many, many other things. On September 22, 1939, the cylinder was solemnly buried in the ground to a depth of fifteen meters.
In all large museums and libraries, there will be an exact plan, carved on metal, of the location of this parcel. It is assumed that in five thousand years, future historians will get the parcel addressed to them and learn about our time from it.

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