Advertisement Article continues below this ad Scientists classify any collection of small, hard particles ... Now imagine you have many grains, like in a pile of sand, and all the sand grains ...

we have ignored the contribution of friction that will also help stabilize the wet pile. However, just as in the dry case, we may expect the friction contribution to be small as a grain rolls ...

Scientists classify any collection of small, hard particles – such ... Now imagine you have many grains, like in a pile of sand, and all the sand grains are in contact with some neighboring ...

Scientists classify any collection of small, hard particles—such as ... Now imagine you have many grains, like in a pile of sand, and all the sand grains are in contact with some neighboring ...