Add Yahoo as a preferred source to see more of our stories on Google. Woman with arms raised camera facing her back during back and biceps workout. Use these five dumbbell exercises to build your back ...

This cross section through the flight muscles of a dancer damselfly shows in blue the muscle fibers that the fly uses to flap its wings. You can also see the nerve that stimulates these muscles in red ...

These dark blue tubes splattered with red and green are fruit fly muscles. This image shows where the nerves and the muscles meet in the larva of a fly. These dark blue tubes splattered with red and ...