Tempered glass is more durable than annealed glass, yet it is neither harder nor softer, easier to scratch or break, nor is it more porous. Tempered glass is intended for use in environments with a high risk of breakage, temperature changes, and contact. Tempered glass is frequently used in architectural applications such as windows, shower doors, shelving, glass railings, and wall cladding. Tempered glass does not shatter into huge, sharp shards that could inflict significant damage, as opposed to annealed glass or what is commonly referred to as "regular" glass. Instead, it fragments into more manageable granular pieces that are less dangerous. Because of this, tempered glass is used in the windows of passenger cars, refrigerator trays, shower enclosures, microwaves, and other frequently used items. Additionally, tempered glass is far more durable than annealed glass. It goes through a difficult manufacturing process that makes it tougher thermally and physically. Glass mus...
The history of the contemporary marathon begins in ancient Greece. Athens, which was around 25 miles away, was to be informed of the Battle of Marathon by a messenger named Philippides. He died after informing them that the Greeks had triumphed when he arrived at the Acropolis.
When the Olympic Games were held in Athens in 1896, it was agreed to hold a race that followed Philippides' path. So they planned the "Marathon," a 25-mile race from Marathon to Athens.
From there, according on the itinerary chosen by the organizers, the distance varied somewhat between 24.85 miles and 26.56 miles. However, in 1908, during the London Olympics, the organizers chose to alter the course so that it would pass the Royal Box, which resulted in a 26.2 mile race. Following that, there was significant variation until the standard was established in 1921 based on the 1908 Olympic marathon distance.
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