What is a convection current?

A convection current is basically where heat rises and cold sinks

Explanation:

When heat is added to something, it expands and rises. This leaves a lower pressure region behind and the surrounding cold rushes in. The cold then is heated and finally the head rises to the top. Then it is cooled. Then repeat :)

cats appear to have glowing cat eyes because the back of their eyeballs includes a special reflective surface called the tapetum lucidum. this lets them see better during the night, giving them a much better vision.

pregnancy happens more and more