This sequence of numbers was named the “Fibonacci sequence” in honor of Leonardo Fibonacci, an Italian mathematician who referenced this order of numbers in a book he wrote in 1202.

Fibonacci retracement levels are horizontal lines that indicate where support and resistance are likely to occur. They are based on Fibonacci numbers.

Though the Fibonacci sequence shows up everywhere in nature, these young mathematicians were surprised to find it in the answer to a variation of the pick-up sticks problem⁠—a nearly two ...