Cutting a Klein Bottle in Half [video]

There's a one-hour long NOVA episode about that story. https://www.youtube.com/watch?v=EcKxaq1FTac

It really is a fantastic story. I can't recommend it enough.

I read it when it was first published, twice in the same week I bought it. It's was a really good story. Sadly I lost my copy, possibly due to lending it to someone.

I've got an old copy and have read it through twice ... and it's currently sitting in my bosses office waiting for him to read it.

I'd say that it's one of my two favorite non-fiction books (the other being "Surely You're Joking Mr. Feynman").

That's amazing-- I had both read that book and seen a few of his appearances on Numberphile, but I never connected the two.

This same phenomenon happened to me not long ago actually, when I discovered that two of my all-time favorite bands shared a guitarist (Greg Edwards of Failure and Autolux). Is there a term for discovering that two people you know of are actually one and the same? I find it to be a rare pleasure-- you can almost feel the mental connections linking themselves together, and afterwards the world feels like a smaller, more logical place.

> I hope one day to be as passionate about _something_ as he seems to be about everything...

The last time I've been so passionate about something was when I was around 10 or 12. Since then I've trained myself to be (and act) not so passionate anymore, because it'll make you look like a weirdo to most people. However, it brought me to a point where it's hard for me to get excited about anything at all, not to speak of expressing it properly...

You could also have used the fact that S² is homeomorphic to the 2-fold sum of S².

I want to be like you when I grow up.

And his TED video too - great stuff.

https://www.ted.com/talks/clifford_stoll_on_everything?langu...

I highly recommend ordering one. The checkout process, packaging, and invoice are almost as good as the bottle itself.

That depends on whether it has been seamed or has edgework. It's incredibly sharp if nothing has been done to it, enough so that merely touching glass edges can cause cuts. Glass is normally seamed before tempering, but that doesn't leave it perfectly smooth either. I've gotten glass splinters from it, along with finding edges that didn't get seamed well, though most sharp edges will break in the tempering furnace (this is why you seam glass prior to tempering). Glass splinters are as horrible as you might imagine and can take weeks to work themselves out, as well as being ridiculously hard to see.

So yeah, I don't recommend the practice if you're not sure, but it may be okay for glass that has had edgework done as this glass gets polished smooth, whereas tempered glass is probably okay, but not always safe.

EDIT: Looks like it's blown glass. No, that's not very safe.

He emits light?

Watch the video that is an hour long about him catching a hacker in the early 1980s