For reasons beyond it simply being an awesome thing to do, scientists have built a saw blade covered in shark's teeth, which which they can hack their way through a hunk of salmon. There is method in this madness, mind.
Shark skin is sleek and dragless, the envy of swimsuit designers. Perhaps less famous is what shark skin's oddly rough surface looks like up close: an eerie matrix of microscopic tooth-like scales. Now, scientists are 3D printing artificial shark skin in hopes of unlocking its swimming secrets.