Bostrom&#x27;s predictions about when human level AI will arrive are mainly based on surveys of computer scientists e.g.<p><a href="http:&#x2F;&#x2F;www.givewell.org&#x2F;labs&#x2F;causes&#x2F;ai-risk&#x2F;ai-timelines" rel="nofollow">http:&#x2F;&#x2F;www.givewell.org&#x2F;labs&#x2F;causes&#x2F;ai-risk&#x2F;ai-timelines</a>