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2. Medieval weights and measures - Wikipedia

   en.wikipedia.org/wiki/Medieval_weights_and_measures

   foot; perch, used variously to measure length or area; acre and acre's breadth; furlong; mile; The best-attested of these is the perch, which varied in length from 10 to 25 feet, with the most common value (16 1 ⁄ 2 feet or 5.03 m) remaining in use until the twentieth century. [1] Later development of the English system continued in 1215 in ...

3. Water - Wikipedia

   en.wikipedia.org/wiki/Water

   The US Institute of Medicine recommends that, on average, men consume 3 litres (0.66 imp gal; 0.79 US gal) and women 2.2 litres (0.48 imp gal; 0.58 US gal); pregnant women should increase intake to 2.4 litres (0.53 imp gal; 0.63 US gal) and breastfeeding women should get 3 liters (12 cups), since an especially large amount of fluid is lost ...

4. List of Chinese inventions - Wikipedia

   en.wikipedia.org/wiki/List_of_Chinese_inventions

   He constructed seven small boats, called 'wine boats', that were as large as 3 m (9.8 ft) long and 1.8 m (5.9 ft) wide which supported a number of mechanical figures of wooden statues called 'hydraulic elegances', each about 0.6 m (2.0 ft) tall, some of them animals but most in human form consisting of singing girls, musicians playing actual ...