Insight by History

The Sea Peoples may have been largely refugee-driven because rapid droughts and crop failures made homelands uninhabitable, pushing coastal and island populations to take to the sea where they coalesced into improvised raiding bands as desperation and numbers grew.
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Roman marine concrete grew stronger over centuries because seawater dissolves lime in the mix, which reacts with volcanic ash to precipitate interlocking aluminum‑silicate minerals (notably aluminum tobermorite) that fill pores and progressively densify and reinforce the material.