פיזיקאי ירה בעצמו תחת המים, כדי להוכיח שהם צפופים מן האוויר (אל תנסו את זה בבית)
It's harder to create movement in water than in air, because water molecules are closer together than air molecules. To show the difference in resistance, physicist Andreas Wahl puts himself in front of a weapon submerged in water and fires it - on himself.