What makes the aqueducts different from most roman architecture

The Romans constructed aqueducts throughout their Republic and later Empire, to bring water from outside sources into cities and towns. ... Aqueducts moved water through gravity alone, along a slight overall downward gradient within conduits of stone, brick, or concrete; the steeper the gradient, the faster the flow.

bts the k-pop group? it stands for beyond the scenes (bulletproof boyscouts) and its an important "us army."   and a boy band. bang shi hyuk started bts in 2013