haricot beans are the dynamics of e=mc square so it is a vegitable
well when my mom cooks beans she puts salt in the water i think that's why it cooks fast
They absorb the water.
They will get sour after a day or two unless you change the water. Keep them in the fridge until you can cook them.
"Haricot" is the French word meaning bean, so "haricot beans" is redundant, and yes, they provide fiber; all beans do.