It has about one-third the density and stiffness of steel; it is ductile and can be easily machined. Naturally, pure aluminum reacts readily with oxygen in air creating a thin barrier oxide layer known as the aluminum oxide next to the metal surface that is about 2-3 nanometers thick.
Orange skin resulting from excessive carrot consumption sounds like something out of a science fiction novel or a bizarre comedy. However, the fact is that yellow skin pigmentation resulting from increased beta-carotene levels in the blood is a real clinical condition called carotenemia. Though carotenemia is harmless, it's easy to confuse with jaundice in young children.
Conversely, the pith (white flesh under the peel, surrounding the orange) of oranges is edible, and appears to be highly nutrient and antioxidant dense. While you likely won't suffer too many ill effects from accidentally eating some orange seeds, it isn't advisable to be eating large quantities of them.