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Vaults and tunnels


Glue tissue paper tube, slightly larger in diameter than a pencil. Insert the pencil. Then carefully pour the sand tube with a pencil so that the ends of the tube were outside. Remove the pencil - and see that tube remained nesmyatoy. Grains of sand form a safety vaults. Insects trapped in the sand out from under a thick layer unharmed.
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 Absorption of water  All equally