Что тяжелее
12-January-2018 Friday
Iron logic
11-January-2018 Thursday
mechanical engineer
11-January-2018 Thursday
What is heavier - a kilogram of iron or a kilogram of cotton wool?
15-May-2017 Monday
Smart girl
04-August-2015 Tuesday
What is heavier - ten kilograms of bricks or ten kilograms of feathers?
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