I’ve received a few emails (thank you!) from readers who note that I have a whole host of broken links in my sidebar.

Yes, I know, these were all working once upon a time, but 10 years is several lifetimes on the internet.

I’m working on pruning and updating them – it will be a work in progress over the next several days. It’s just a sad state of affairs that so many of these sites are inactive or don’t even exist anymore. Even the Space Elevator Reference is now an empty, parked site for crying out loud!

So, patience please, dear readers – WIP…