Quite a lengthy one for you this time.
The ‘well-known fact’ that “If a flea were the size of a human, it could jump over the Eiffel Tower” is an interesting misconception – one that disregards laws of scaling and structural engineering. A brief analysis of the claim can reveal some of its substantial flaws. But before we go any further, let’s use our imaginations, if only as a preliminary thought-experiment.
Picture a human-sized flea (let’s say about 170cm in length), henceforth named ‘enormo-flea’. It has the exact same proportions as an ordinary flea, but happens to be 170cm long.