Earth Day started in the 1970s. Here’s an Earth Day fact everyone should know: Earth Day was first observed on April 22, 1970, followed in 1972 by World Environment Day. It has ...

Earth is full of surprising secrets that sometimes seem like they belong in science fiction stories. From strange natural events to hidden places deep underground or in the oceans, many facts about ...

A college student in a gas mask "smells" a magnolia blossom during the first Earth Day on April 22, 1970 in New York City. Credit - AP More than 8 billion peopleinhabit Earth, and soon a springtime ...

It's Earth Day, a day when people around the world celebrate the planet we call home. In honor of the occasion, here are some facts about Earth you may not know. Earth’s diameter, or the distance ...