Fireworks
Of ancient Chinese origin, fireworks evidently developed out of military rockets and explosive missiles, and they were used in [blank] combinations for celebrations. During the Middle Ages, fireworks [blank] the spread of military explosives westward, and in Europe the military fireworks expert was pressed into [blank] to conduct pyrotechnic celebrations of victory and [blank] . In the 19th century the introduction of new ingredients such as magnesium greatly heightened the [blank] of such displays.
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