Leaky package does not leak

need to experience: a plastic bag, water, sharpened pencils.
1. Pour the water into a plastic bag half.
2. The pencil pierces through the package in the place where it is filled with water. Bottom line: if you poke a plastic bag and then pour water into it, it will spill out through the holes. But if the package is first filled with water by half, and then pierce it with a sharp object so that the object has remained stuck in the package, the water flow through these holes will be almost no. This is due to the fact that when rupture of the polyethylene molecules attract it closer to each other. In this case, polyethylene is tightened around the pencil.

Source: mirfactov.com/