When shoes slide across a floor, wave-like deformations of the sole can generate squeaking. The pitch of the squeak depends on the rate at which deformations are generated.
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Italy was only unified in 1861. Before that, it was considered a "battleground of Europe", with foreign powers repeatedly exploiting its territories. Italians learned to rely and trust only the very few, rather than "the state", to look after them.
Nasa announced on Friday radical changes to its delayed Artemis III mission to land humans back on the moon, as the US space agency grapples with technical glitches and criticism that it is trying to do too much too soon.