Summary: Foam is used for energy management in most helmets. There are many types, but EPS is still the choice for most bike helmets. The ideal foam would be stiffer in hard impacts, softer in lighter impacts, light, cheap, reliable to manufacture and easy to ventilate.
A coal preparation plant (CPP; also known as a coal handling and preparation plant (CHPP), coal handling plant, prep plant, tipple or wash plant) is a facility that washes coal of soil and rock, crushes it into graded sized chunks (sorting), stockpiles grades preparing it for transport to market, and more often than not, also loads coal into rail cars, barges, or ships.
What do you reply when you are asked what you do? Maybe that you produce corn, wheat, lamb, beef, wool or chickpeas? Yes, we farmers ARE doing these things, but we are actually in the business of maximising the capture of light energy from the sun, for the production of chemical energy and sugars in the plant.