He discusses how scientists over the years have identified the experience and developed theories to explain it.

VOA: special.2010.02.24

She began to explain to the students how to solve a very difficult problem.

VOA: special.2009.10.25

"Using x-ray crystallography to obtain snapshots of the ribosome in action, they have been able to explain how the ribosome selects and couples together amino acids to form proteins."

VOA: standard.2009.10.07