The Fibonacci sequence is a series of numbers where each number is the sum of the two preceding ones, usually starting with 0 and 1. The sequence looks like this:

$0, 1, 1, 2, 3, 5, 8, 13, 21, 34, 55, 89, 144, \dots$

In this sequence, the number 55 is the 10th Fibonacci number.

If you have any questions or need further details, feel free to ask!

Here are five related questions:

1. What is the 15th Fibonacci number?
2. How is the Fibonacci sequence used in nature?
3. Can you explain the formula for finding any Fibonacci number?
4. What are the first 20 numbers in the Fibonacci sequence?
5. How do Fibonacci numbers relate to the golden ratio?

Tip: Fibonacci numbers have interesting properties, including their relation to the golden ratio and their appearance in nature, such as in the arrangement of leaves or the branching of trees.