It can be hard to find the right community to post a link in. Figuring out the rules and knowing who’s reading them (and sometimes what they’re really about) might cause someone to give up. (Especially when people complain about ‘this isn’t the place for that’ without stating the better alternative.)
Bill Gates, except when Ballmer was there.
For Krogh, the source of the number, it was a quite reasonable estimate, which was about all that was possible at the time. And it was ‘wrong’ by less than an order of magnitude … compared to the newest estimate. AND an estimate of a truly unimportant number is as good as you can get (or need) in many cases. What’s the total length of all the ice cores drilled since Camp Century? And their total volume is?
Have a look at Gorbachev. A big loss, that.