When it comes to high-risk science demonstrations, Norwegian physicist Andreas Wahl definitely has previous. His last daredevil exhibition, which aimed to underline the concrete nature of a well-established scientific theory, saw him drop 14 metres to the ground with only a rope and a counter-weight between himself and horrible injury.
Not satisfied with putting his neck on the line once, Andreas has gone and done it again with another ballsy science practical. This time, he's brought a rifle to a swimming pool to show why guns fired underwater are far less likely to kill you. Rather than shoot at a dummy, or a slab of cottage cheese like a normal person, Wahl turns the gun on himself (which, we think you'll agree, is pretty next level on the courage scale).
Scientifically speaking, this is all about resistance. It's harder to generate movement in water than in air, because water molecules are inherently closer to each than air molecules and this 'huddling' behaviour means moving things struggle to break through them.
As this crazy video shows, even a bullet leaving a gun at high speed will only travel a short distance underwater before dropping harmlessly to the floor. That being said, we'd still be extremely reluctant to try this. Guns hurt people. Guns kill people.