they discovered the first way of purifying water
no
That should be 'was important', since there haven't been any vikings around for nearly one thousand years.
Making weapons dates back to prehistory. The vikings were making weapons before there were Vikings.
It is as important as any other history knowledge. Vikings might have related to other people in the continent. The fact that you're asking is another proof of how important it is.
Vikings wives would take care of the farm and continue to make cloth with the sheep's wool
ships
vikings made there own sawds out of what they found or created, vikings had metals therefor they would make there handal of there sawd then sharpen the blade.
caca flavor becouse vikings used goat poo to make pudding
whale sperm
out of wood
No, they did not.