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

ADVICE FROM CEOs on Instagram: "Roger Federer played 1,526 singles matches and won nearly 80% of them. But surprisingly, he only won 54% of all points played. Even the greatest in the game lose almost every second point. His mindset? Every point matters deeply-until it’s over. Whether it’s a double fault or a highlight-reel smash, it’s still just one point. The ability to move on quickly is key to staying mentally strong. Federer’s lesson is clear: let go of failure instantly: and stay locked in

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