You know, radio is a great thing.
Here I am! Flying high above the earth, but my voice is coming across just as if I were sitting in front of you.
Communicating by voice alone has its drawbacks, though.
For example, I can't use hand gestures to clarify what I mean.
And, as it turns out, that makes a big difference.
Researchers at the University of Otago in New Zealand wanted to know how much a relevant hand gesture helps to communicate an idea.
They had volunteers watch video clips of a woman saying different simple phrases, such as “the square box,” or “peel the banana.”
In some, she simply said the phrase without moving her hands.