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Fluorescence is the emission of light by a substance that has absorbed light or other electromagnetic radiation. Learn about the history of fluorescence discovery, the physical principles of fluorescence mechanism, and the practical applications of fluorescent materials in various fields.
A comprehensive list of flags sorted by their dominant colors, including states, territories, former, and other geographic entities. Find flags with red and blue, gold and white, gold and black, and more color combinations.
Apples are round, edible fruits produced by apple trees (Malus spp.), which originated in Central Asia and are widely cultivated worldwide. Learn about the history, classification, genetics, cultivation and uses of apples, as well as their cultural and religious significance.
A list of educational video series produced by the National Geographic Society, with VHS release dates and ISBN numbers. The series covers various topics such as wildlife, geography, history, culture, and science.
Sushi is a Japanese dish of vinegared rice with various toppings, such as seafood, vegetables or meat. Learn about the origin, evolution and varieties of sushi, from narezushi to nigirizushi, and how to enjoy it with soy sauce, wasabi and ginger.
The 2022 Asian Games, also known as Hangzhou 2022, were a continental multi-sport event that was originally scheduled to take place in September 2022, but were postponed to October 2023 due to the COVID-19 pandemic. The games featured 45 nations, 11,909 athletes and 481 events in 40 sports, with the motto "Heart to Heart, @Future".
A comprehensive table of 118 chemical elements with their names, symbols, atomic numbers, properties, and origins. The table is organized by the number of protons in each element's atomic nucleus, also known as the periodic table of the elements.