Male koalas mark their territory by rubbing their chests on a tree. Male koalas have a dark scent gland in the middle of their chest.

The trickiest tongue twister in the English language is apparently "Sixth sick sheik's sixth sheep's sick". Give it a try and see for yourself.

The reason why tattoos do not vanish even though we shed our skin is because the dye is injected deeper into the dermis part of the skin. It is only the epidermis that we shed.

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