Grain kernels may stick together in a grain bin, forming a crust. When grain is removed, a hollow can form under the crust, creating a bridge. That bridge can collapse under a person's weight and burying the person in seconds.

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Grain kernels may stick together in a grain bin, forming a crust. When grain is removed, a hollow can form under the crust, creating a bridge. That bridge can collapse under a person's weight and burying the person in seconds.