![](https://i.kinja-img.com/image/upload/c_fit,q_80,w_636/22ed4c0844b3ca40a7b072d129eac4bc.jpg)
Our most-read science stories this week contain a few timeless life lessons. One, don’t go into an MRI room carrying metal, particularly if that metal is a loaded gun. Two, don’t cross a killer whale, even if you’re a great white shark. And finally, never judge a sea cucumber by its cover—no matter how repulsive that…