And there is more to learn. Jonathan Rottenberg says the science of crying is still in its infancy.

VOA: special.2009.01.28

Dr.Martin says,by monitoring the progress of multiple patients from infancy through adulthood, doctors can gather crucial evidence about the effectiveness of the procedures."

VOA: standard.2010.01.01

The Sonex and Sikorsky projects are two examples in a growing field of innovation in electric powered flight - most in their infancy.

VOA: standard.2010.08.11