Estimating brain states is one approach, but recognize the brain is complex and able to adapt, making it unlikely we'll ever run out of unique permutations. With 86 billion neurons and two possible states each, there are around 10^25,705,292 potential brain states.

With exponential human population growth at 1% per year, it would take `7,000 years to reach 10^100, a number representing the particles in the observable universe. Our experiences may expand with advanced technology, generating new brain states and extending this timeline.

It is challenging to define "truly original thought," and even with exhausted brain states, new combinations of existing ideas could generate novel insights. The interplay of genetic, environmental, and cultural factors influencing creativity and innovation further complicates predicting the limits of human originality.
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