tech

when a material is heated 

then the atoms or molecules in the material moves randomly 

in all directions inside the material 

if all the atoms or molecules could be forced in certain directions 

or in the same directions 

then the heat could be moved from one side of the material 

to the other side of the material 

for example a metal wire that is heated 

then the heat moves from one end of the wire to the other end of the wire 

the question is how to achieve that result 

lasers could be used to push atoms in a certain direction 

the problem is that there are very many atoms in a material 

so many lasers would be needed 

but one laser could hit one atom 

when that atom passes in that laser's field of fire 

and since all the other atoms moves randomly in all directions 

then all the other atoms will also pass in that laser's field of fire

and/or lasers could be used to push only a few of the atoms 

so that those atoms bounce other atoms 

so that atoms start moving in the desired direction 

it's probably easier theoretically 

and more difficult technologically 

but the advantages are enormous