Side Node: computer programing is kinda cool. It is a set of incantations which actually does work.
EDIT: Hello, all you down-voters and people who say I should read the article before commenting :-) I to, don't like it when people just start commenting without reading the article.
I also don't like it when people take what a pop-sci writer too seriously. In this case, I was interested enough to read the original article in Nature, where it says this practice was for cursing (see quote at the end)
Don't forget Gell-Man's Amnesia :-)
"Howitt described how magic was employed to harm a victim using a ritual fire and a wooden object smeared or attached with a piece of human or animal fat (major sources of lipids): “In all these tribes a general, I may say almost an universal, prac- tice has been to procure some article belonging to the intended victim. A piece of his hair, some of his faeces, a bone picked by him and dropped, a shred of his opossum rug, or at the present time of his clothes, will suffice, or if nothing else can be got he may be watched until he is seen to spit, when his saliva is carefully picked up with a piece of wood and made use of for his destruction..."