self Maths Puzzle

What is special about the following sequence of numbers?
8 5 4 9 1 7 6 10 3 2 0

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self Other Question

An observer 1.6m tall is 20√3 away from a tower. The angle of elevation from his eye to top of the tower is 30◦. The height of the tower is You have a lighter and two fuses that take exactly one hour to burn, but they don't burn at a steady rate. For example, one fuse could take 59 minutes to burn the first inch and then burn the rest of the fuse in the last minute.

How would you use these two fuses to measure 45 minutes?