Add Yahoo as a preferred source to see more of our stories on Google. This year marks the 55th anniversary of Earth Day! Every year on April 22, people worldwide mobilize to address some of the most ...

Add Yahoo as a preferred source to see more of our stories on Google. There's so much to celebrate in the month of April. The fourth month of the calendar year ushers in warm weather, tulips and Earth ...

The planet is almost 25,000 miles around and 4.54 billion years old, and humans are still discovering some of the amazing secrets it's hiding. …and sometimes we may forget just how incredible our home ...

This year marks the 55th anniversary of Earth Day! Every year on April 22, people worldwide mobilize to address some of the most urgent threats facing our environment, from climate change to ...