By Tanya Hill, Museum Victoria

At least twice a year, Earth comes between the sun and the moon. The result is a lunar eclipse, where we see the splendid sight of Earth’s shadow falling across the moon.

By Robert Young, University of Salford

I run 50 kilometers per week on my treadmill and eat a calorie-restricted diet; this is something our ancestors didn’t have to do. But then they didn’t sit at a desk all day and certainly did not have access to such energy rich food.

Unfortunately our animals have joined us on the couch. Take a walk down the pet food aisle in the supermarket and you may be surprised to see rows of diet cat and dog food.

By Anson Mackay, University College London

The Aral Sea has reached a new low, literally and figuratively; new satellite images from NASA show that, for the first time in its recorded history, the largest basin has completely dried up.

In June of this year, Facebook provoked a widespread public outcry after it became known that it had tried to manipulate the emotions of nearly 700,000 of its users as part of a social “experiment.”

By Mark Blumberg, University of Iowa; Alexandre Tiriac, University of Iowa, and Carlos del Rio Bermudez, University of Iowa

By Nicholas Ellaby, University of Liverpool

From eyes to the gap between the toes, we are covered in bacterial colonies.

Between 500 and 1000 unique species live in our gut alone. We provide an ideal environment for bacteria: warmth, moisture, nutrients and protection.