Cheap sunglasses are worse than no sunglasses. They do not block ultraviolet rays, but only the visible range. In the sun, the diaphragm of the eye expands and the retina burns out with ultraviolet light. Plastic glasses do not block UV rays.

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Denmark's current flag design was first used in 1219. No other modern country has used its flag for so long.

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A Falcon 🦅 was tracked migrating from South Africa all the way to Finland. In 42 days she flew over 10,000 km in almost straight lines, at speeds of the 230 km/day.

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There's a volcano in Indonesia that spews blue flames. Indonesia's Kawah Ijen and other craters emit rivers of light from burning sulfur. A dazzling, electric-blue fire can often be seen streaming down the mountain at night.

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The parliament of Iceland, established in 930, is the oldest active parliament in the world.

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The Sun accounts for about 99.86% of the total mass of the Solar System. The Sun's mass is approximately 1,988,550,000,000,000,000,000 billion kg. Which is equivalent to about 330,000 Earths.

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The grizzly bear has the best sense of smell on earth.

It is about 2-3 thousand better than that of a person, and 100 times better than that of a dog. Grizzly bears distinguish smells at a distance of more than 30 km.

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The longest beard in the world belonged to Hans Langseth. He died in 1927, his beard was 5.33 meters long.

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In 2017, Adidas launched a line of shoes called "Adidas x Parley" which were made from recycled ocean plastic. Each pair of shoes in this collection was made using approximately 11 plastic bottles. The partnership between Adidas and Parley for the Oceans aimed to raise awareness about marine pollution and promote sustainability by utilizing recycled materials in their products. The success of this initiative led to the sale of over 1 million pairs of shoes made from recycled ocean plastic in 2017.

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In China, there is an "Elderly Rights" law which makes it illegal for anyone who has parents over 60 not to visit them regularly.

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Playing a musical instrument improves memory. Researchers have found that experienced musicians notice their mistakes faster and correct them.

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Magpies are considered to be one of the smartest bird species. They are known for their intelligence and problem-solving abilities. Magpies have demonstrated various cognitive skills, such as tool use, complex social behaviors, and the ability to recognize themselves in mirrors.

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British people say "Happy Christmas" because in the 19th century the word "merry" also meant "intoxicated" so they wanted to separate it from public insobriety.

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Bob Marley was buried with his red Gibson guitar, a Bible open to Psalms 23 and a bud of marijuana.

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The founder of KFC was a loser until he was 65, he had no money, he borrowed $87 and started making fried chicken wings. He failed 1,009 times before he was able to sell his first franchise. By the age of 88, he had become a billionaire.

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Treating a wound with maggots can save a limb from amputation, the treatment is known as larval therapy. Maggots secrete digestive enzymes that dissolve dead tissue, destroy bacteria and promote healing.

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Some dinosaurs would swallow rocks, known as gastroliths, which would stay in their stomach to aid in the digestion of food. The rocks would act as grinding stones, helping to break down tough plant material or assisting in the mechanical digestion process. These gastroliths were often smooth and rounded due to the abrasive action in the dinosaur’s stomach.

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"Sphenopalatine ganglioneuralgia"
is the scientific term for brain freeze.

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The prey has a horizontal shape of the pupil to better scan the horizon. The predator is vertical to better focus on prey.

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