Water is quite arguably the most important substance on Earth. Its unique properties make it an incredibly versitile tool. Aside from fueling life, it's useful in cleaning, cooking and transportation, just to name a few things.
Gravity is a force that we experience every minute of our lives, but hardly notice or give a passing thought to in our daily routines. Have you ever wondered what gravity is and how it works? Learn about the force of gravity in this article.