How do you influence people to get them to agree with you?  Robert Cialdini, author of “Influence: Psychology of Persuasion,” has been studying the science to figure out what makes people say “yes.”

Throughout time, from Aristotle to a much more recent Dale Carnegie, humans have been asking – how exactly can we influence those around us? Arizona State University Professor, Robert Cialdini, says the key is mentioning one word – “advice.”

“It turns out if you change one word, and instead of asking for that person’s ‘opinion,’ you ask for that person’s ‘advice,’ they take a step towards you,” says Cialdini.

Read more at CNBC.