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Tempered Glass

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
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What are the tiny led lights near the CCTV cameras represent?

The term IR LED, or simply infrared LED, refers to those tiny led lights that surround the CCTV cameras. They are used to provide lighting so that security cameras, which are off during the day, can view in low light and the dark. Through those tiny led lights, cameras can use infrared to take pictures at night. The spectrum of light that is invisible to the unaided human eye includes infrared light. However, surveillance cameras can see it. In fact, the LED emitters are producing infrared light. This implies that your security camera can see what's happening at night, even when it's absolutely dark and you can't see anything. You may have observed this when your security camera goes from day to night vision; you can hear a slight clicking sound as the infrared illumination turns on.

What is the history of marathons?

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.