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LANDAU AN DER ISAR, GERMANY - NOVEMBER 09: Upside view to the crown of a common spruce, seen in a forest on November 8, 2011 near Landau an der Isar, Germany. The German government is conducting a nationwide project to estimate the number, variety and geographic distribution of trees and forests in Germany, as well as their condition and health. Approximately a third of Germany is covered in woodlands, and though that territory has actually expanded since 1989, some analysts fear demand for wood will outstrip supply in coming years due to national growth in industry and bio-energy needs. (Photo by Johannes Simon/Getty Images)

US cities are losing 36 million trees a year. Here's how you can stop it
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Top stories

Help for homeless

A suburbia for the homeless exists and they can live there forever
Homelessness has gotten worse in LA county despite huge investment
After four decades, a homeless man is returning to college to finish degree
A teen who was in and out of homelessness has been accepted to 17 colleges

Impact positivity

For every cupcake this 13-year-old sells, he gives one to the homeless
This teen with Down syndrome is an honorary flight attendant
Some hospitalized kids don't have stuffed animals. So this little girl took action
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A gift from a stranger tucked into a book sets off a chain of random acts of kindness

Mental health

This Marine turned to yoga to save his life. He's now saving others
Why you should learn Mental Health First Aid
How to find help for depression and anxiety
Gardening becomes healing with horticultural therapy
There's a severe shortage of mental health professionals in rural areas.

#MakeAnImpact

Drowning is the leading cause of accidental death for young children. Here's how to prevent it
How black women are walking away from the obesity epidemic
Millions of students aren't reading at grade level in the US. See how one group is helping
Sexual abuse survivors find strength and dignity through fashion
Three questions when you're volunteering

Ebola outbreak

Help efforts to fight Ebola crisis
Ebola outbreak is an international public health emergency
Former NBA player helps CDC with a PSA on Ebola
Fighting Ebola is hard but mistrust and fear is making it harder
Battling Ebola in the Congo

Fighting addiction