Do We Live in a Simulation?

This is one of many questions that has plagued philosophers for thousands of years. In his 2003 paper Are You Living in a Computer Simulation?, the Swedish philosopher, futurist, Oxford professor and Director of the Future of Humanity Institute and Governance of AI Program Nick Bostrom covers several topics that underlay the possibility that life as we experience may indeed be "fake news": Substrate-Independence -- Consciousness is not necessarily a property born of biology and could be formed from other materials or even energy. Technological Limits of Computation -- Given our current rate of progress in computational power, memory storage and AI, it may be only a matter of decades before true artificial consciousness is created, leading to the era of "posthumanity". Therefore, when it saw that a human was about to make an observation of the microscopic world, it could fill in sufficient detail in the simulation in the appropriate domain on an as‐needed basis. If there were a substantial chance that our civilization will ever get to the posthuman stage and run many ancestor‐simulations, then how come you are not living in such a simulation?