fern
self similar fractal: D = log(S)/log(L)
shell
logarithmic spiral: r = e^(a*theta)
golf
surface area: SA=4πr2
bubble clusters
voronoi pattern: Rk = {x ε · I d(x,Pk) ≤ d(x, Pj) for all j ≠ k}
x axis
y = 0
sine wave
f = NP/60hz
rate of change
f(x) = df(x)/dx
strings
third harmonic: λ = 2/3L
delta
channel length - L= 104h [ρ/((σ-ρ)gD_50 ) / (wU2)/w_max ]β