These hill slopes of Yuanyang county plunge nearly 2 thousand meters to the floor of the Red River Valley, each contains literally thousands of stack terraces carved out by hand using basic digging tools.
When younger kids learn computer science, they learn that it's not just a confusing, endless string of letters and numbers, but a tool to build apps, or create artwork, or test hypotheses.
Since the dawn of human ingenuity, people have devised ever more cunning tools to cope with work that is dangerous, boring, burdensome, or just plain nasty.