It is called echolocation. They hear sounds which "bounce" off inanimate objects (cave walls etc......) and they are naot blind.
there is no magnetism to an emerald
yes
yes
Yes. Magnetic lines of force penetrate paper with little to no difficulty.
Electricity are produced from magnetism from induction. Induction is a magnetic field.
Yes, the "old" televisions use magnetism to controll the movements of the electrons.
Yes, it does.
yes
there is no magnetism to an emerald
yes ,actual navigation use electronic navigation and paper one soo they need compas and sundails
Yes, magnetism passes through polystyrene
yes
yes, yes it does
Yes
yes
Yes, This is the navigation. The G.P.S is a navigation device. Where is the navigation?
yes