I'm curious to hear about instances of ambitious projects that failed for technical reasons or were cancelled because development was taking too long. We get a lot of insight into the internal dynamics of companies like Theranos where the failure of the core technology wasn't accepted by the leadership. I haven't heard much from the inside about examples of failed startups that went down quietly (ex: TransAtomic power[0]).[0]https://www.technologyreview.com/2018/09/25/240126/nuclear-startup-to-fold-after-failing-to-deliver-reactor-that-ran-on-spent-fuel/