There was a funny picture going around the Internet about a 6-foot social distancing sign which made a math mistake, because the people along each edge of the square are less than 6 feet apart. However, it turns out that if you just have two of the people in the square standing on their heads, then it is possible to have the 4 people in those places such that every pair of heads is exactly 6 feet apart! The spots on the ground directly beneath the 4 people form a square. How many feet long is each side of that square?
