Whats the difference between Throwing and Thrown Weapon skills?
The Throwing skill allows you to throw anything. A Thrown Weapon skill is used to throw a specific “aerodynamic” weapon. Rocks, round/spherical grenades, and other non-aerodynamic items are thrown using the Throwing skill. If you don’t have Throwing or an appropriate Thrown Weapon skill, your default is DX-3 to throw at a specific target, or DX if you just want to lob something into a general area. (see pp. B49, B52 and HT45).