Copper and lutetium metal ions chaperone this molecular strand into a three-twist knot. Credit: Credit: Stuart Jantzen, Biocinematics It’s annoyingly easy to tangle your headphones into a mess of ...

Setting up a compound bow can be complex but there are various skills that any archer or bowhunter should know and right near the top of that list is tying a D-loop on the string. I came across this ...