If humans could try an experiment:  If we could go an entire day void of using spoken language…  This would pose interesting.  If we could co-survive for three days without using verbal language, not only would human consciousness become obvious, but many systems of human interaction would prove faulty; and we would have no choice but to fall on the ground laughing at ourselves.  Such a medicinal laughter could promote longer life and a higher quality of trade and commerce. This global laughter could change whole attitudes throughout the world, and believe it or not, more plants would grow as a result.  (Plants would thrive on the carbon dioxide expelled by global laughter.)