the concept is that when you put conditioner in your hair and rinse then residue is left on weighing down your hair. the national safety council recommends that you place a smoke alarm on each floor of your home and in every bedroom. i hope apple uses its money more wisely. basics things to remember are triangles - each side of each triangle can only be touching one other side of another triangle. the lead changed hands twice in the final two minutes. i wish i could be of more help. 