Experimental data is seen in the upper panel and simulational data is seen in the lower panel. The solid lines show the force felt by a sensor placed in a sphere as a force pulse passes through it traveling left to right and then, later, as it returns but with an accompanying baby wave. The size of the baby wave depends on the softness of the wall. The existence of these baby waves have not been observed before and can have important implications on how energy is shared in nonlinear systems. Credit: Francisco Melo and Surajit Sen.