The idea that everything you research must be within safety requirements. According to the well-known scientist, Cave Johnson, safe science is stupid. In fact, he believes that you should "marry safe science if you love it so much". Also, you should "invent a special safety door that won't hit you on the butt on the way out".
Cave Johnson: Science isn't about why - it's about why not. You ask, Why is so much of our science dangerous? I say, Why not marry safe science if you love it so much? In fact, why not invent a special safety door that won't hit you in the butt on the way out - because you are fired!