বাংলায় পরতে ক্লিক করুন... এখানে
What should you expect to actually answer the big question, the BBC has an article, much larger, it will take time to translate. I have to share the link. Perhaps the answer may come in handy. http://www.bbc.com/future/story/20140918-the-reality-about-roaches. And many of us are talented, they have a friend who can find the correct answer. Thanks for the nice question.