Sinks: The Curve That Saves LivesWhy every drain has that clunky U-shaped pipe.

From the show

Why it looks like that

Every sink in the modern world hides a U-shaped pipe section known as a P-trap. This seemingly simple curve performs a critical sanitary function by using gravity to hold a water seal. Without this trapped water, dangerous and foul-smelling sewer gases would flow freely back into your home.