Welcome Chuck. ...you tell to friends and they tell two friends...
For the measurement guys:
Fibonacci numbers are the numbers in the following sequence:
0,\;1,\;1,\;2,\;3,\;5,\;8,\;13,\;21,\;34,\;55,\;89,\;144,\; \ldots.
By definition, the first two Fibonacci numbers are 0 and 1, and each subsequent number is the sum of the previous two. Some sources omit the initial 0, instead beginning the sequence with two 1s.
In mathematical terms, the sequence Fn of Fibonacci numbers is defined by the recurrence relation
F_n = F_{n-1} + F_{n-2},\!\,
with seed values
F_0 = 0 \quad\text{and}\quad F_1 = 1.