Let me start by saying it is amazing what they can do with lasers these days, including shooting them into your eyes on purpose to fix things, and if this has anything to do with the work that Waterloo’s Dr. Donna Strickland did to earn the 2018 Nobel Prize in Physics, then I will take a bold stand in favour of it.

the word of the day is ‘retinopexy’

So … a few months ago I had a Bilateral (both eyes) Laser (Light Amplification Something Something Radiation) Retinopexy (treatment for a detached or torn retina.) and today I had a followup check

This is a picture of one of my (two) eyes earlier today. Doesn’t it look great? Especially with the pupil all dilated like that?

(Incidentally if anybody ever asks you “Have your eyes ever been checked?” you should say “No, they’ve always been brown.” Trust me. Nobody in the eye care business has ever heard this or any other joke.)

Here’s what you can’t see. At the back of the eye, your retina is attached to what we lay people would call “the back part of your eye”. (The doctor described the anatomy of the eye to me in technical terms: “Picture a basketball filled with a water balloon.” ) For a while it was coming apart, but now, my retina (water balloon) part is still attached to the back (basketball) part, thanks to the awesome power of LASERS.

wait, back up

Here’s what happened.

Last spring while sailing on one of them cruise ships in the middle of the Atlantic, it occurred to me that my right eye was bothering me, especially when looking at bright objects like, for instance, “the Atlantic.” Blurry, seeing lots of “floaters”. Had noticed it for months, I thought, like an idiot, I was just “tired” and attempted the home remedy of “rubbing my eyes”.

At the urging of my cruisemates because this was quite the topic of dinner conversation for several nights during which time everyone discussed their theories of what it could be along with a list of possibly similar problems that had happened to them, I made an appointment to see my optometrist – another fine Waterloo person incidentally – for when we got back, and she took a look-see and announced, “Hmmm. Good thing you came in. You’re right, something is wrong. I’m referring you to a specialist.”

the specialist

Off we went to the fine ophthalmology clinic at St. Mike’s. After a round of incredibly powerful eye drops, the doctor did an exam – a procedure since repeated several times, and I will never get used to this – where he basically presses his big eye examining headset thing RIGHT ONTO YOUR EYE and shines a light with approximately the power of the sun into it, instructing you to look left, left and up, up, up and right, right, and I’ll say that it’s not painful but it is just incredibly annoying and you naturally want to shut your eyes, but they (the doctors) would rather you didn’t do that, and you just want it to be OVER, and eventually it is.

“Hmmm.” the doctor said. “Now let’s look at your other eye.”

But wait! The problem is in my right eye! My left eye is fine.

“Let’s look anyway.”

Well, OK, knock yourself out, I guess, but you’re wasting your time looking in the other eye except maybe for reference but … what’s that?

So, surprise! I had two torn retinas.

Visions of complicated processes had been racing through my head; I had been researching things on Google and discovered there was a surgical process that involved doing something to your eye that required you to lie face down for several weeks of recovery. Well wouldn’t that be fun. I could put my laptop on the floor, I could get one of those massage table things so you can stare straight down … You know what, not only might it get me out of travelling to a meeting I didn’t want to do, but there would be great comedy potential in this. I can make this work.

I assume I come back for some complicated surgical thing in a few weeks, then right?

“No, we’re not doing that – we’ll fix it today. Go wait outside for a bit.”

the immediate procedure

30 minutes later I was lying on my back in a dark room, with my eyes numbed by various magic drops, and the doctor performed a Laser Retinopexy in each eye – a procedure where he wears a head-mounted laser thing that I never really did get a good look at it, and leans right in on your eye and shoots lasers at the retina, which if I’m understanding this right, deliberately creates some scar tissue at the back of your eye to hold the retina in place.

During this procedure, you feel tremendous annoyance and desire for it to be over, but not really any pain; you DO see an incredible imaginary purple fireworks show as the laser does its thing.

Afterwards, thank goodness I had Cathy with me to drive as I had no interest in looking at any bright light sources, such as “outside.”

the aftermath

I’ve now returned a few times for followup checks. Everything seems to be fine. My vision isn’t getting better – this is nothing like the procedure they do to correct your eyesight; in this case they’re shooting a laser at a totally different part of your eye. But it’s not getting any worse either. Back to the optometrist for a new prescription and some new glasses – horribly overpriced, due to an eyeglasses cartel you probably know nothing about – but things are better.

I’ve since learned quite a few of my friends and neighbours have undergone something similar. Isn’t science amazing? It makes getting old tolerable.

Many thanks to Dr. Muni and Dr. Paterson, and my cruisemates for urging me to do something.

what did this all cost?

Nothing. Other than parking. Thank you, Ontario health care system.

Should you check your bag? Here’s the thing, you can never be sure ahead of time if it’s a good idea.

I’m in the middle of a travel snafu. I spent all day yesterday hanging around the airport, trying hard to get to West Virginia but it was so windy that flights kept getting cancelled, and my backup plane was cancelled, and then the backup backup was cancelled, and then my ticket for the backup backup backup was issued too late to actually board.

At one point or another I was booked on all these flights. And I went 0 for 8! A new one-day personal best.

And it was all made way more complicated because I CHECKED A BAG. I know what you’re thinking. Steve, hasn’t your slogan for years been

One Of Steve’s Travel Slogans (collect the whole set)

The only way the airline can lose your bag is if you GIVE IT TO THEM.

Well, yeah, I used to think that. But lately as I get older, I’m starting to value Convenience, and checking a bag is certainly Convenient. Why?

I usually travel with a backpack with my laptop in it – no, I am not checking that – and a small carryon-size fits-in-the-overhead no-I’m-sure-it-will-fit rollaboard bag.
I’ve always loved this 1996 Toshiba commercial –

So anyway, about checking a bag.

Reasons To Check A Bag

• Convenience. Less junk to carry through the airport
• If you’re only carrying on one bag, you can put it in the overhead rather than under the seat in front of you. I hate it when the airline announces “Your primary storage space is under the seat in front of you.” No, that is the primary space for my GIANT FEET thank you very much. But if you’re carrying on two items, then you really ought to put one into this spot. And you’ll be cranky.

Reasons NOT to Check A Bag

• You have to wait and pick it up at your destination. Sometimes it’s quick, sometimes it isn’t.
• They might lose it. See slogan above.
• You are Boarding Group 37 on some airline you never fly, and you know the overhead will be full.
• You feel guilty about slowing everybody down as you bring all your earthly possessions onto the plane.

Reasons Why I Personally Might Check A Bag Despite The Slogan Above

I have modified my NEVER CHECK rules slightly. Now I would say there are situations where I will check a bag.

1. In my professional opinion, is it a tight connection where the airline could screw this up and lose my bag? A tight connection through Denver? => Don’t Check. They’ve lost my bag multiple times on that route, one time telling me that it was actually headed to Istanbul.
2. Is it a very full flight where they are already begging people at the gate to check something because the overheads are going to be full? => Check. (Especially if it’s a gate-check situation where you retrieve the bag on the jetway at the destination, not the baggage claim.) But not if it’s a screwup situation like situation #1.
3. Is it a long flight where I have a crummy seat with limited legroom and would really like some room for my size 13 feet underneath the seat ahead of me? => Check.
4. Am I heading home, and a misdirected bag wouldn’t be the end of the world, because they’ll deliver it to my house the next day, and anyway I have a spare toothbrush at home? => Check.

I have a Tile bluetooth tracker in my bag too which gives me a slight sense of security that if my bag is misdirected, I might be able to figure out roughly where it is.

Where This Can All Go Wrong

If you checked a bag, and something goes wrong, you are in a bad state. Airlines require you to travel on the same flight as your bag, so if you want to switch to another flight, your options are now limited. Can the airline get your bag off of flight A and onto flight B? Maybe. But it’s sure easier if you have all your bags with you.

Yesterday I checked a bag, and the travel snafus started piling up even before leaving Toronto. I wound up heading home without travelling, which adds a whole new layer of confusion – you have to retrieve your bag somehow, and for a transborder flight, this involves heading down some strange corridors, filling out forms, being escorted back into the baggage area, going through Canada Customs again even though you never left the country. It probably took me 90 minutes to get my bag back yesterday.

What Airlines SHOULD DO

Really, the process of checking a bag is better than it used to be; they’ve improved the ability to track bags, and, soon, airlines will be giving you active bag tags that broadcast their location and letting you check on the app and see where your bag is. (With my Tile tracker, I can often tell if the bag is actually on the plane with me; that’s cool.)

But … The idea that airlines charge money to check bags is the main problem. People are cheap and don’t want to pay those fees, so they drag everything they own along as carryon, slowing everything down.

If airlines made checked baggage FREE it would speed boarding, and make everybody happy, so of course it will never happen

My friend Brad Templeton has some interesting ideas. Let passengers reserve specific space in the overhead. Hmm.

So what are you doing today?

I’m back at the airport again today, still trying to get to Charleston. And today, I didn’t check. Don’t want to tempt the gods of travel again.

Paul Erdős received an honourary degree at my University of Waterloo B.Math. convocation ceremony. Don’t know the name? You should; he was one of the great mathematicians of the 20th century. And highly quotable! One of my favourites –

A mathematician is a machine for turning coffee into theorems.

— Paul Erdős

He had no fixed address, and travelled the world doing math research, staying in the homes of other mathematicians along the way, and publishing more mathematical papers than any other mathematician in history. He was a superb choice for an honourary degree.

I was a bit of a slacker in my undergrad days and only vaguely knew of Erdős, but to this day, I can remember a professor telling us about the Erdős-Feller-Pollard correspondence. I can’t tell you what that correspondence is, but I definitely remember the term “Erdős-Feller-Pollard correspondence.”

I remember he led off his convocation speech like this (approximately)

I travelled from Hungary to Waterloo for this event, and then I am going to Los Angeles, and after that to Australia and then back to Hungary. So I am travelling 360 degrees around the world to receive one degree. A total of 361 degrees.

polite laughter from audience, Erdős continues

Now, 361, that’s an interesting number. It’s 19 squared. I remember when I was 19 …

Erdős numbers

Everybody has an Erdős story as he kept constantly travelling and collaborating, and in the math world, there’s an idea called the Erdős number. You could define it recursively.

• Paul Erdős is Erdős 0.
• If you collaborate with someone whose Erdős number is N, then your Erdős number is N + 1.

So, if you co-wrote a paper with Erdős, your Erdős number is 1 (and you have exalted status in the math world). If you collaborated on a paper with someone who was Erdős 1, you are Erdős 2, and so on. There are 511 people with an Erdős number of 1, and there can be no more, since Erdős passed away in 1996.

People take this fun idea very seriously, and compile huge databases of Erdős numbering. See the Wikipedia article for starters. All 56 winners of the Fields Medal, the most prestigious prize in math (since there is no Nobel in math) have a finite Erdős number. 159 of the 200 Nobel Physics prize winners have an Erdős number, all ranging from 2 to 12. (I should check and see what the number is for Waterloo’s Donna Strickland, recent Nobel Physics winner hmm. It’s probably pretty low; there are several people connected to Waterloo with an Erdős number of 2 or less.)

Someone even wrote a paper analyzing the Collaboration Graph from a graph-theoretical perspective with the observation that it would have some interesting property if only two specific authors had collaborated on something; those two quickly whipped up a math paper on some trivial topic to ensure the graph stayed interesting.

famous people with Erdős numbers

And Erdős received another honourary degree from Emory University on the same day that baseball legend Hank Aaron also received one. Someone thoughtfully arranged to have a baseball autographed by both Erdős and Aaron; thus, Hank Aaron has an Erdős number of 1.

Lots more info at the Erdős Number Project web site. I’ve always loved this math silliness. Einstein was Erdős 2. Marie Curie, Erdős 7. (thus, Pierre Curie, Erdős 8.) Bill Gates is Erdős 4! (During his brief stay at Harvard, Gates came up with an algorithm in a combinatorics class that was later formalized in a paper by Harvard computer scientist Christos Papadimitriou, who is Erdős 3.)

so what is MY Erdős number?

Charlie Colbourn taught at Waterloo and was Erdős 1, as a result of a 1985 paper – which I’m sure you read – “A conjecture on dominating cycles”, B.N. Clark, C.J. Colbourn, and P. Erdös, Proceedings of the Sixteenth Southeastern Conference on Combinatorics, Graph Theory, and Computing, February 1985, pp. 189-198. Looking through his c.v. I recognize a few people I remember from grad school who wrote with him, and who are thus Erdős 2, and I am very jealous.

He collaborated on at least one paper with Kellogg S. Booth, who was the director of Waterloo’s computer graphics lab where I hung out as a grad student. Booth is Erdős 2.

Booth and John Beatty co-directed the graphics lab and published various things. Beatty is Erdős 3.

Beatty was my master’s supervisor and about the only scholarly thing I ever wrote was my master’s dissertation, “Software for the Tektronix Geometry Processor”, and he heavily critiqued and edited it. So I can claim a tenuous link to being Erdős 4.

kevin bacon

This probably reminds you of the whole “Six Degrees of Kevin Bacon” thing where people compute a distance between actors and Kevin Bacon. Bacon is 0, people in any movie with Bacon are Bacon 1, etc. The definitive source for this info is the Oracle of Bacon.

This of course, leads to the idea of the “Erdős-Bacon Number”, which is the sum of your Erdős and Bacon numbers.

black sabbath

Taking this idea to another extreme, music has the Sabbath Number. How close are you to collaborating with Black Sabbath. Naturally this leads to the greatest of all numbers…

Erdős-Bacon-Sabbath Number

I kid you not. People track the combined Erdős-Bacon-Sabbath number. No, seriously.
Stephen Hawking owns the lowest known Erdős Bacon Sabbath number – 8.

• Erdős Four. (I’m surprised it’s that high.)
• Bacon Two. According to the Oracle of Bacon, Hawking appeared in “Queer Duck: The Movie” with Camryn Manheim; she appeared in “Cop Car” with Kevin Bacon.
• Sabbath Two. Stephen Hawking made a guest appearance on Pink Floyd’s album “The Division Bell”. Dave Gilmour of Pink Floyd played one number on the “Rock Aid Armenia” album which also featured Tony Iommi of Black Sabbath. Therefore, Hawking’s Erdős-Bacon-Sabbath number is an amazing EIGHT.

Brian May – guitarist of Queen, Ph.D. in astrophysics – is Erdős-Bacon-Sabbath 9. Also amazing. There’s an interesting list of celebrities with small E-B-S numbers.

ok ok ok what’s mine

This is going to be a stretch. I can very tenuously claim to be Erdős 4.

my bacon number

Bacon? Hmm. Let’s see. back at Waterloo I was the musical director for the annual 1987 FASS show. That year, the star of the show was John Watson, a student at the time who went on to an acting career. You might remember him from the classic commercial for Maple Leaf Foods. Back Off. Get Your Own Sandwich.

John, who I hope might vaguely remember me, has done a few things – here’s his demo reel

John appeared in “Haven” with the late Natasha Richardson. She was in “The Favour, The Watch and the Very Big Fish” with Bob Hoskins. Hoskins was in “Balto” with Kevin Bacon. So John is Bacon 3, and I can stake a very weak claim to being Bacon 4.

my sabbath number

Sabbath, hmm. This will be tricky.

Let’s start here –

• In 2004 (and again in 2009) I played with the Shuffle Demons in their Saxophone World Record Attempt. 930 saxophones in Yonge-Dundas Square! (Playing the theme from “Hockey Night in Canada.”) (I don’t exactly play the sax but I have an alto, and learned just enough notes to play along on the ‘easy’ part.)
• Richard Underhill of the Shuffle Demons has played with the Neville Brothers.
• The Neville Brothers song “Voodoo” on their album “Yellow Moon” was co-written by Tony Iommi of Black Sabbath.

Neville Brothers: Sabbath 1

Richard Underhill: Sabbath 2

Me: Sabbath 3

my grand total

I am proud to claim the Erdős-Bacon-Sabbath number of 4 + 4 + 3 = 11.

So what’s yours?

One of today’s headlines reminded me that I too once had an interesting email conversation with Jeff Bezos.

Back in 2001, Amazon had rolled out a “gift list” feature, where anybody with an account could publish a list of things they wished other people would buy for them. And Jeff Bezos had his own public list. Some reporter mentioned how weird it was that the CEO of Amazon would want people to buy things for him.

Naturally I took a look. I liked Amazon, I had bought plenty of books from them, Jeff seemed like a good guy, and, crucially, his birthday was coming up. I thought it might be fun to buy him something inexpensive off of his list. And see what happened.

One of the cheaper items on the list was this set of car jumper cables. What the heck. One click later, I bought it and attached a gift message saying something like “Hey, happy birthday Jeff, I saw you wanted these, and I hope you don’t ever need them.”

Now, planning ahead, I also created my own gift list and added a few things to it – I forget what exactly, it might have been some fancy binoculars – just in case, you know, somebody wanted to reciprocate and give me a gift on my birthday from my wish list.

Well that didn’t happen, but I did get a nice thank-you email from Jeff Bezos thanking me for the jumper cables and agreeing that yes, he hoped he’d never need them.

So that’s my personal Emails with Jeff Bezos story.

PS. Also in writing this little post I have to say it is a great nostalgia trip going back through your old Amazon orders. The jumper cables were the first product I ever bought from Amazon that wasn’t a book or a CD …. and the very first thing I ever bought, in 1996, was “Dave Barry in Cyberspace”. Highly recommended, would buy again.