Two blind people live together. Usually, in order to distinguish their clothes, both of them will mark the clothes. On this day, they went out together and bought two pieces of clothes, one black and one white, but the two forgot to mark the clothes. Put it together. Because the style of the clothes is exactly the same as the fabric, they can't tell which is black and which is white.
So, can you think of a way to help them quickly distinguish their clothes?
Black clothes absorb heat more easily than white clothes, so you can hang two clothes in the sun and touch them after a while. The hotter one is black, and the cooler one is white.