modern world. one man says some companies haven t changed their policies because they simply don t know about the problem. thanks very much, nina. there are widely varying ximts of how many slaves there are in the world right now. at the very least, it s 10 million people. let s take a look at a high higher-end number. it could be up to an astounding 30 million people, according to a harvard researcher. this number is about as many people living in tokyo, which is widely considered to be the most populous city in the world. how do we define modern day slavery? kevin bales is the president of the nonprofit organization free the slaves. this is what he says f. we try to define it, you know, to me, slavery means one person who s completely internet control of another person, that they use