Alien blobs in the Earths mantle, and much more
b'Hummingbirds sidle sideways to slip through tiny gaps; Do you speak fish? A new online dictionary of fish sounds debuts; When girls are in the audience, all-boy choirs change their tune; Ancient whales - tiny and titanic - from 40 million years ago; Alien blobs lurk inside our planet, and could be feeding supervolcanoes; Quirks & Quarks Listener Question.'