Answer:
the last one, Underwater weighing
well no, as long as its your own child, if its some other child that you see on the street then yes, but if its like i said your own or for instance your helping in a sunday school class,
You need to put the picture
Hopefully this should help you
http://gcc.glendale.edu/fire/Documents/ClassMaterials/Ropes/Ropes-VFA08.pdf
Knots start on page 35
plz thank me, it motivates me to answer more of your questions :)
