My washing machine suffered from a water supply problem, so I engaged a plumber to fix it. He leveraged his burly side to take out my large washing machine. I complimented him on his strength, to which he blushed and said, “No, not strong. That’s why I used water.” He had earlier sprayed water at the bottom of the washing machine, and that was when I felt a Eureka! moment. This is how people use water to reduce friction between two surfaces in their everyday life!