4.669

Universal constants combined with the laws of physics help define the fundamentals of reality. Speed of light, PI - 3.1416, the ratio of the diameter to the circumference of a circle, the two laws of thermodynamics and E = mc2 — means "energy equals mass times the speed of light squared." It shows that energy (E) and mass (m) are interchangeable; they are different forms of the same thing are just some well-known examples of why this notion rings true. 

Check out the video. You will learn something. I know I have. :)

In mathematics, specifically bifurcation theory, the Feigenbaum constants are two mathematical constants which both express ratios in a bifurcation diagram for a non-linear map. They are named after the physicist Mitchell J. Feigenbaum.

Feigenbaum originally related the first constant to the period-doubling bifurcations in the logistic map, but also showed it to hold for all one-dimensional maps with a single quadratic maximum. As a consequence of this generality, every chaotic system that corresponds to this description will bifurcate at the same rate. It was discovered in 1975.[1][2]

Feigenbaum constant δ expresses the limit of the ratio of distances
between consecutive bifurcation diagram on Li / Li + 1

4.669 resides ... everywhere.