There39s something hypnotic about the consistent click clack of a newton39s cradle swing a metal bead from one end and it will hit the chain sending its energy through the other balls to set a bead on the other end swinging in a delayed mirror like fashion from a scientific point of view it perfectly demonstrates conservation of momentum and energy from our point of view it39s probably the coolest and most addictive desk toy ever this extra large version just makes it even more fu