New Delhi, (BollywoodWorld.com) Megastar Amitabh Bachchan, who caught up with actors Ranbir Kapoor and Katrina Kaif on the sets of reality show “Bigg Boss 3″ recently, is all praises for the latter and says she is a “modern day marvel”. “Katrina is a modern day marvel. From a non-Hindi speaking young shy and uncertain lady of