This improbable membrane can trap flies in a jar - and odor in a toilet

Well that's just cool.

The membrane described above can block small particles but allow larger particles through, a thoroughly non-intuitive method of filtering.

Then again, water is weird. It holds together, 'healing' itself via intermolecular forces. In this case, the addition of sodium dodecyl sulfate - something I've heard called sodium lauryl sulfate - allows the water membrane to be penetrated and then come back together.

In order to break through the membrane, particles need enough momentum (mass times velocity, natch) to break through the membrane, so larger particles have an easier time to get through. Smaller particles, then, have to be moving far faster if they're going to break through.

And automatically, people go straight to the possibility of keeping the poop smell in a toilet.

Because everyone poops.