Are you familiar with"silly putty the strange substance which is both solid and liquid-like? If you pull it slowly in comparison with the reptation time, the material flows like a very viscous liquid If you form it into a ball and strike it quickly, it bounces like rubberAre you familiar with "silly putty", the strange substance which is both solid and liquid-like? If you pull it slowly in comparison with the reptation time, the material flows like a very viscous liquid. If you form it into a ball and strike it quickly, it bounces like rubber