The recent medical breakthrough was the culmination of many long years of experimentation.

Magma is the primary source of all the earth's rocks.

Saint Elmo's Fire is a phenomenon that occurs when ships discharging harmless electrical charges into the atmosphere appear to shine.

Milk is purified by heating it at 60*C for thirty minutes.

Although monkeys occasionally menace their enemies, they are usually not dangerous unless they are provoked.

In the Navajo household, grandparents and other relatives play indispensable roles in raising the children.

Regular use of this cream will help to relieve the rough, dry condition of your skin.

Because leeches' behavior patterns are simple, it is relatively easy to identify which neurons govern which behavior.

After the bottom fell out of the market, he was virtually bankrupt.

She didn't say much, but her tone of voice insinuated more.