Today is a sunny day. In my science class, I learned about fish gills. l’ve had this misconception that gills functioned similarly to our noses, allowing fish to inhale oxygen and exhale carbon dioxide underwater. It was wrong. In reality, fish take in water through their mouths, and then the water flows out through their gills, only trapping the oxygen in the process. It's a one-way system. It taught me that sometimes things don't work according to common sense, and we shouldn't take anything for granted until we verify it ourselves.