CBS News' Adam Yamaguchi traveled to Japan to explore why that country is on the leading edge of robot development in the new CBSN Originals documentary, "Replacing Humans: Robots Among Us." Watch it on CBSNews.com starting Sunday, April 29. The full hour streams on CBSN Monday, April 30, at 8 p.m., 11 p.m. and 2 a.m. ET.
