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science × 144technology × 13
mathematics × 11
astronomy × 10
united-states × 9
middle-ages × 9
ancient-history × 9
world-war-two × 7
soviet-union × 5
india × 5
ancient-greece × 5
philosophy × 5
history-of-ideas × 5
engineering × 5
needham × 5
physics × 5
20th-century × 4
europe × 4
nazi-germany × 4
ancient-rome × 4
19th-century × 4
economy × 4
religion × 4
china × 4
cultural-history × 4
