Materials of cogon grass cardboard food packaging?

1. Set up an inclined tray below the blackboard resting freely at the upper end and hinged at the lower end. The chalk dust will fall in the tray and start sliding down into a waiting bin As the chalk dust may not always slide down into the bin you will need to jiggle and shake the tray a bit from time to time 2.So set up a low powered electric motor with a slow speed reduction gear attached to an eccentric disc under the tray such that the eccentric disc touches the tray at the upper end 3.

Every few minutes the tray will incline and decline like a rocking horse 4. Design the inclination angle such that the chalk dust freely flows at the highest inclination required.

I cant really gove you an answer,but what I can give you is a way to a solution, that is you have to find the anglde that you relate to or peaks your interest. A good paper is one that people get drawn into because it reaches them ln some way.As for me WW11 to me, I think of the holocaust and the effect it had on the survivors, their families and those who stood by and did nothing until it was too late.