# On Phi

The most beautiful thing we can experience is the mysterious. It is the source of all true art and science. (Albert Einstein)

Nature hides her secrets because of her essential loftiness, but not by means of ruse. (Albert Einstein)

All life is biology – All biology is physiology – All physiology is chemistry – All chemistry is physics – All physics is math. (Dr. Stephen Marquardt)

Measure what is measurable, and make measurable what is not so. (Galileo Galilei)

Geometry has two great treasures: one is the Theorem of Pythagoras; the other, the division of a line into extreme and mean ratio. The first we may compare to a measure of gold; the second we may name a precious jewel. (Johannes Kepler)

This post is about Phi (Φ) – 21st letter of the Greek alphabet

Phi – but not fi fo and fum

Phi, in traditional Greek numerals a value of 500 (φʹ) or 500 000 (φ)

Phi – the ratio of each successive pair of numbers in the Fibonacci Sequence

Phi – the symbol for the golden ratio and on other occasions in math and science

Phi – applicable in mathematics, art, architecture, biology, astronomy, music, physics, navigation, geology, engineering, economics, philosophy, and more

Phi – squared is a number exactly 1 greater than itself: 2.618

Phi – the ratio in the length of a DNA molecule

Phi – the ratio of the diameter of Saturn to the diameter of its rings

Phi – the sound of this song if the numbers were assigned to piano keys. Enjoy.

Additional Information about Phi at this site dedicated to phi