Farrowing and piglet phase

(1) Can boars determine the number of piglets and if so how? (2) How long should it be between piglets arriving during farrowing? (3) What is the average weight of a piglet born? (4) How many hours does it take for the piglet to become aware of there surroundings? (5) How long does it take piglets to get to know their mum and her grunt.? (6) How many hours in a day do new borne piglets sleep? (7) How does a sow get them on to solid feed at 10 days and how does she know when to do this?