If a picture is worth a thousand words, how many words must an animation like this be worth? Explaining echolocation gets much easier when you have tools like this to add the images to the words. Anyone who went to the Whales:Tohora exhibit at the Museum of Science in Boston would have seen this clip. If you missed it, here’s your chance to see it. Our thanks to the Te Papa Museum in New Zealand for allowing us to link this address to the online portion of our Hunt for Knowledge exhibit.