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The sword developed from the knife or dagger. A knife is unlike a dagger in that a knife has only one cutting surface, while a dagger has two cutting surfaces. Construction of longer blades became possible during the 3rd millennium BC in the Middle East, first in arsenic copper, then in tin-bronze. Blades longer than 60 cm were rare and not practical until the late Bronze Age because the Young’s modulus of bronze is relatively low, and consequently longer blades would bend easily. The development of the sword out of the dagger was gradual; the first weapons that can be classified as swords without any ambiguity are those found in Minoan Crete, dated to about 1700 BC, reaching a total length of more than 100 cm. These are the “type A” swords of the Aegean Bronze Age.