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While holidaying on the Greek island of Paxos, I came upon a pebble beach where many of the stones had apparently been "engraved" by some type of creature. This example (see photo above) is roughly 50 by 60 millimetres, but the same sort of pattern was also present on much larger stones. What type of creature made these, and how and why?
The Last Word has told us that lions prefer to eat the fat and organs of their prey rather than the muscle. Apparently, muscle tissue is relatively poor in energy and vitamins (for lions, at least), and lions are able to make glucose in the liver from protein, so do not need carbohydrates. What, then, are the equivalents in humans? And if, when civilisation crashes, I finally manage to catch a stray cat or dog, which parts should I eat first, and why?