respiratory system

Breathing Hot and Cold

One of the most common questions that I get is where do I get the ideas for these experiments. Some are old classics that I try to give a new angle. Others are the result of questions sent to me by subscribers. Some of the ones that I like the best are the ones that just pop up, seemingly out of nowhere. This is one of those. It also comes with its own story, which makes it even better.

The story is one of Aesop's fables. If you have never read any of these, go read some. It is well worth the time.

Bread Bubbles

This experiment is about bread. If you have used my website for long, you know that I like experiments with food, especially when it is tasty food. We regularly bake bread, and there are few smells that are better than the smell of freshly baked bread.

272

Tree frogs can be very small, but very loud. How can they tolerate making such loud sounds?

280

For respiration in animals, they take in oxygen and give off carbon dioxide. What about respiration in plants?

412

Every morning, a huge flock of these beautiful birds visits us on their daily journey around the canyon. They have very specially adapted noses. What is so special about them?