Find out from newspapers and popular science articles any new fossil discoveries or controversies about evolution.

Find out through internet and popular science articles whether animals other than man have self-consciousness.

A disc is free to rotate about an axis passing through its centre and perpendicular to its plane. The moment of inertia of the disc about its rotation axis is I. A light ribbon is tightly wrapped over it in multiple layers. The end of the ribbon is pulled out at a constant speed of u. Let the radius of the ribboned disc be R at any time and thickness of the ribbon be d (lt lt R) . Find the force (F) required to pull the ribbon as a function of radius R.