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Learn about the origin and meaning of the Italian tricolour, a vertical flag of green, white and red, adopted in 1946 as the national flag of the Italian Republic. Discover how the Italian colours were inspired by the French Revolution and became a symbol of Italian unification.
Learn the meanings of various plants in different cultures and traditions, from flowers to trees to herbs. Find out how plants are used to express love, friendship, gratitude, hope, and more.
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.
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.
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.
Learn about the standardization and categories of road signs in the US, based on federal regulations and state supplements. See examples of regulatory, warning, guide, and informational signs, as well as their shapes and colors.
Learn how European traffic signs vary by country despite a common convention. See examples of different sign shapes, colours, texts, and meanings for various road classes and situations.