How to make a super sand pile

By compacting thin layers of sand in a cup, between which small metal grids have been inserted, one obtains an extremely resistant sandpile : it easily tolerates the weight of a man. The grids in fact withold the horizontal thrust of the grains, greatly increasing the resistance of the sandpile, and thus preventing its collaps. Co-production : amàco, les films du lierre, CRAterre-ENSAG Licence Creative Commons : BY NC ND Facebook → Twitter → https: