Dr.Henri Breault
most of them are but there are really smart kids that knows how to open such containers.
a medication bottle
Colin Murdoch from New Zealand
they work up into a certain age
it depends on the container and the factory its made in
dr.henri
Metal
If you mean the caps , one side is a child-proof attachment , the other isn't .
1.If the medicine bottles did not have child proof caps because if it's kept on a low shelf or a low place a child can pick it up,open it and drink it. 2.Some medicines are gassy like cola so if a child might try to open it,it can burst open and hurt the eye of the child. 3.Medicines are drugs so if the child overdoses it,it gets a serious situation. 4.Some caps are made of steel,steel is sharp and sharp things might cut your child's hand.
Proof and Bizarre
of course lego halo is already invented and itcant have proof if its invented . its just common sense.