The Chinese government launched its new stealth fighter jet this month, to protest from some in the U.S. press, who have been stating the technology was stolen. To rebut said claim, some pointed out, China has technology of its own in the area of defense and invented gunpowder. 

However, my main question is directed at every world government with this technology - if it is stealth, why can we see it. It's just like movies claiming a character is invisible, but you can still see them. Just teasing.