• 1 Post
  • 61 Comments
Joined 22 天前
cake
Cake day: 2025年6月24日

help-circle




  • It removes the “hope intelligent life evolves fast enough”.

    If it was only Uraniam, then you need U-235. That has a half life of about 700M years. Cut in half 2 more times, and there’s almost none left. So if intelligent life took another 1.5B years to develop on Earth (which it easily could have), then that path is cut off.

    With Thorium, the sun would probably expand to a red giant first.


  • Thorium-232 has an extremely long half life (longer than the age of the universe) and it’s reasonably abundant. That’s the isotope useful for the thorium fuel cycle.

    So it’s not quite that bad for threading this needle. The fuel cycle is a little more complicated than uranium–it’s not fertile as it is–and that could slow down R&D of a new nuclear program by getting stuck at some step.








  • Just a note on the timeline. Reagan’s policies were already in full swing by the time Hillary wrote that book. The Clintons were political nobodies from Arkansas when Reagan was in office. Bill was governor, but can you name the governor of Arkansas today without looking it up? I’m guessing most people outside the state can’t.