Why Didn't Scientists Ask My 5th Grade Teacher?

I just read an article about water spiders and their method of surviving under water. The incredibly smart scientists at the University of Bern, Switzerland have determined in a fresh new study that a water spider spins its silk to produce an air bell when it lives under water. This was taught to me in 5th grade by my biology teacher.

This tip is for those same scientists, so they don't need to spend so much time studying this: There's some water spiders that have some sort of hairs on their bottom that traps the air and they can dive! (Also taught in 5th grade...)

Also, I would recommend that those scientists read those same 5th grade biology books we have in Finland to gain some base knowledge before these ground breaking studies.

...Just trying to help here.

This also raises some questions. Where and how the scientists thought the water spider builds its nest before they found out about the silky nest underwater?