A variety of communications, such as laughter, a wave, or a sigh, are readily understood by just about anyone, and even by some animals. Other signs and signals are more esoteric, perhaps only understood by just one or a few.
A variety of communications, such as laughter, a wave, or a sigh, are readily understood by just about anyone, and even by some animals. Other signs and signals are more esoteric, perhaps only understood by just one or a few.