How can a robot differentiate between positive or negative product reviews?

Some of the sites have the rating system for example 3 stars, or the bot has a feature that can capture keywords that include a list of possible indicator that it is a negative review. For example if a user review includes a word "bad" or "horrible" the bot will flag that as a negative review.

Please give brainliest.

a study funded by private corporations refuting global warming

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?