"It's the little things citizens do. That's what will make the difference. My little thing is planting trees"

So says Nobel Peace Prize winner Wangari Maathai, whose vision and energy has led the planting of billions of trees across the world.

For many years Martin Murrillo earned a living selling water on the streets of Cartegena, a city on the northern coast of Colombia. Born into poverty, he started work very young and missed out on much of his schooling.

Gifted with a lively and curious mind, the young Martin began a process of self-education. This involved reading absolutely everything he could lay his hands on. Every moment he wasn't serving customers was a chance to bury his head in a book, writes Vida Adamoli

Imagine going from Brown, an Ivy League College, to Los Angeles Women’s Penitentiary in three years, emaciated and addicted to crystal meth. How could things go so wrong and in such a short space of time?

You may not have noticed but very odd things are happening in one of the brightest parts of the Milky Way - our very own galaxy.

The picture shows the Great Nebula in Carina which is home to some truly massive stars. In our universe size really does matter, as being either too big, or too small, can have huge consequences.

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Depression may be the world's most common mental health problem but, as Diane Southam explains, it's one of the most misunderstood