Can we clone rhinos?

Proponents of cloning say such a method could work to revive the northern white rhino (Ceratotherium simum cottoni), a subspecies down to its last two ind...

Why do boiled eggs go black?

Our answer. The dark ring that forms around the yolk of a hard boiled egg is called a sulphur (sulfur) ring. When the egg is boiled the sulphur and hydrog...