Compact Fluorescent Lightbulbs
The amount of mercury in a CFL bulb does not pose much of an environmental hazard.
Good
Liquid Calories
Cutting sugary liquids may have an extra advantage for weight loss.
Drying Rivers
Climate change and other factors are drying up many of the world's rivers.
Nickel & Oxygen
A drop in nickel may have triggered the rise of oxygen on Earth.
Life Light
The way light scatters off distant planets may reveal whether life exists on them.
Dancing Animals
Some animals can dance to a beat, while others have no rhythm.
Rockets & Ozone
Possible increases in rocket launches could affect the Earth's protective ozone layer.