Favourite piece of technology

I think that technology be indispensable when the human created the need to this technology. Logically, daily days use elements of the technology is the most important demonstration of the complete depends for this tools in the human.  For me, the most indispensable piece of technology, usually, is the bicycle, I like ride for the translate in the morning or when get back from the rehearse with my big band (comparsa) The bicycle is the best invent for the human creativity but the simplicity in the parts of shape (wheels, bar, pedals etc…) and the autonomy when created a industrial design it’s anything depend in your force, you generate the electric independence. Day by day also use the different tools, created for this modern human, indispensable for her live, using for this eating or cooking, but, this is necessary?