Scuba divers use a bcd to control buoyancy. it is essentially a bag that can be inflated or deflated to prevent excessive sinking or floating. how do bony fish accomplish this?

there is no universally accepted definition of art. although commonly used to describe something of beauty, or a skill which produces an aesthetic result, there is no clear line in principle between (say) a unique piece of handmade sculpture, and a mass-produced but visually attractive item. we might say that art requires thought - some kind of creative impulse - but this raises more questions: for example, how much thought is required? if someone flings paint at a canvas, hoping by this action to create a work of art, does the result automatically constitute art?

answer///radio frequency interference (rfi);