Curiosity Cookies

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.

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.