David Gross, a Nobel laureate recognized for his contributions to string theory and quantum gravity, has issued a stark warning regarding humanity's future. He suggests that the biggest threat is not a lack of scientific breakthroughs but rather the risk of nuclear conflict and geopolitical instability. Gross estimates the annual risk of nuclear war at 2%, which translates to a potential lifespan of human civilization of just 35 years. With over 12,000 nuclear warheads active globally, even a limited conflict could have catastrophic consequences. He emphasizes that the breakdown of arms control treaties and rising tensions among nine nuclear powers complicate deterrence efforts. Furthermore, Gross raises concerns about artificial intelligence potentially controlling nuclear launch systems, which could escalate conflicts rapidly. His insights stress the urgent need for global cooperation and proactive measures to mitigate risks, highlighting that scientific progress alone cannot guarantee survival. Gross's legacy in physics, particularly his work on asymptotic freedom, contrasts sharply with his current fears about humanity's future, underscoring the disconnect between intellectual advancement and societal stability.