As U.N. makes history on Earth Day, Leonardo DiCaprio reminds us not to rest on laurels

Finding a purpose through unlikely heroes

How wolves and warriors help each other heal

Shane Burcaw transcends hardship through humor (and he thinks you can do the same)

A tasty tale of reinvention

Roger the ripped kangaroo crushes buckets for kicks

'I Will Always Write Back': A life-changing promise

Be an explorer, wherever you are

From Bird Brain to 'Urban Birder'

When the neighbors are grizzlies, live WildSmart

8 nature-focused projects for citizen scientists

10 female astronomers everyone should know