The video tutorial uses a creative visualization of lighthouses on a number line to explain the concept of summing the brightness of these lighthouses using the inverse square law. This leads to the discovery of a special mathematical value, pi^2/6, and introduces a proof by Yan Wund that connects this sum to circles.

What is the intensity of light from the second lighthouse compared to the first?

• 1/4

• 1/5

• 1/3

• 1/2

How is the brightness of the third lighthouse calculated?

• 1/4

• 1/9

• 1/3

• 1/2

What is the sum of the reciprocals of the square numbers up to infinity?

• pi^2/10

• pi^2/4

• pi^2/6

• pi^2/8

Why is the sum of the reciprocals of square numbers considered special?

• It equals pi squared over six

• It equals pi cubed over six

• It equals pi squared over four

• It equals pi cubed over four

What does the lighthouse visualization help to prove?

• The connection between sums and circles

• The correlation between numbers and geometry

• The link between light intensity and distance

• The relationship between light and sound

Who is credited with the clever proof related to the lighthouse visualization?

• Leonhard Euler

• Isaac Newton

• Carl Gauss

• Yan wund