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After a three-hour drive, I stopped my car in front of a wall with three doors: a silver door on the left, a gold door in the middle, and an iron door on the right. Which door would I open first?

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A pyramid and a tetrahedron with edges of the same length are glued together on a triangular face. How many faces does the resulting solid have?
Wikipedia says that the equator is about 40,075 Kilometers (24,901 miles) long; 78.7% is across water and 21.3% is over land. Estimate the number of people who holding hands in a human chain cover the length of the equator.