1) Man off the street lifts 40 kg barbell without breaking a sweat.

2) Woman off the street struggles with it and then gives up.

3) Scientists with PhDs and lab coats in a billion-dollar facility look at each other. The project leader tells the others: "Let's examine the properties and molecular structure of this barbell. Something must be wrong with it. Men and women are supposed to be equal. Also, keep looking until you find a man who can't lift it either."