Explanation : Leonhard Euler was one of the most prolific mathematicians in history, publishing over 800 papers throughout his lifetime. He revolutionized mathematics by creating much of the notation we use today, including e, i, f(x), and the summation symbol. His most famous contribution is Euler's identity, e^ (int) 1 = 0, often called the most beautiful equation in mathematics as it connects five fundamental constants. He also made groundbreaking work in calculus, number theory, graph theory

Knowledge | Curiosity | Discovery on Instagram: "This footage records a distinct display of avian play behavior in which a crow intentionally utilizes a green plastic disc as a sledding implement to traverse a snow-covered, corrugated roof. The action demonstrates the advanced cognitive faculties of the species, specifically regarding tool manipulation for non-survival purposes, generating viral appeal through the anthropomorphic resonance of recreational sliding and the stark contrast between w