Did you know that zero is considered the most important digit in the numerical system for its concept changed the world. The concept made our world modern. Imagine a world without zeros—would we be able to trade? Where would technology be? What transportation would be here:  autos, jets, rockets, robots?  zero — think about it. I have and haven't finished yet.  The concept of exchanging a service for nothing is evolving and one day, maybe we can sit and do nothing but play and create and share wonderful things. That nothing would be precious!