Category: Updates

Why do cows have big eyes?

This is caused by the tapetum lucidum in cows, which is an area of chartreuse pigment located just below the retina at the level of the choroid, in the b...

What is hand drill?

A hand drill is a manual tool that converts and amplifies circular motion of the crank into circular motion of a drill chuck. Though it has been replaced...

How are caterpillars made?

One day, the caterpillar stops eating, hangs upside down from a twig or leaf and spins itself a silky cocoon or molts into a shiny chrysalis. Within its ...