What bottlenecks would you consider for the drake equation that prevent the development of intelligent, technologically advanced life

[LSLGuy]

@John_DiFool

That was partly my motivation for a thread I started last year asking just how much more dangerous the Cretaceous would be for humans than any period during the Age of Mammals (alas people misconstrued what I wante

You mean this one?

You are transported back to 70 million BCE

…how much more dangerous would it be than going back 20,000 years say? [To eliminate the effects of the Pleistocene extinctions as well as the subsequent civilization and industrialization trends.] What would you need to bring with you to stay alive? Would anything less than an armored combat vehicle give you a chance? Is a T-Rex or a Raptor going to be more dangerous than any Pleistocene predator? Howzabout a swim in the ocean, and a Mosasaur vs. a shark (yes I know sharks were around back t…

I just searched for any post with your username and the word “cretaceous” in the last 2 years.

Beyond the search, yes, I agree w your points in your post just above.