Wednesday, December 11, 2013

A crescent moon by any other name...



My father-in-law recently taught me the Chinese phrases for first quarter and third quarter moons, they are :

  Down   Bow string  = third quarter


Up    Bow string  = first quarter


Now, why would westerners think of quarter moons being left to right or right to left while the Chinese think of them up to down or down to up?  Both kinds of moons occur during difference times of year, based on the relative orientation of where you are standing on Earth, where the moon is in the sky, and where the Sun is.

Describing the moon as a "bow" in this phase is better than "quarter" for sure though, right?  We call it quarter because of where it is in the 29 day cycle.

In either case, everyone in the southern hemisphere sees their right hand side lit when we see the left hand side.  'Cause they are upside down in the southern hemisphere! Crazy business this is, living on the surface of sphere!

Slacker or Loser?


The year: 1995

The place: Shadyside, Pittsburgh

The event:  My buddy Borris' birthday

 Twenty-five and life was good.  I had passed my qualifying exams thus ensuring a smooth passage from being a Master's student to being an actual PhD student.  I was sharing a house with 3 other physics grad students and we had all just finished our slog through some 18 years of schooling and pretty major exams to finally arrive at the goal: ground breaking, original research.   After a few years of finding my feet in Pittsburgh and getting a new group of friends, I felt I had finally come to a comfortable, happy place in life.  I was in great shape, having lots of fun – crewing early in the morning, swimming in the afternoons, dancing in the evenings.  On top of the world as they say!

Borris was a little older – turning the big 3-0 today.  I was excited – this was a big birthday and I was looking forward to having a great evening of hopping a few bars, getting something to eat and hanging with friends.   Borris and I shared an interest in the intersection of computing, neuroscience, and physics. Walking my way to the bar where we were to meet, I thought about just how free I had become now that exams and coursework were over.  It was intimidating and yet liberating at the same time to pursue my own research and to be free of pre-set curricula.  What was I going to do with the rest of my life?  So many possibilities and so many directions to go in while still sheltered from the "real" world.

I entered the bar and my mood momentarily brightened even further – Borris has picked a sweet spot.  Some cool music playing at just the right volume; you could have a private conversation without yelling. Beautiful people scattered about.  I saw my buddy at the bar and headed over, motioning to the barkeep to hook me up with one of whatever Bo was having.

Instead of finding my friend upbeat and excited, I found him a bit sluggish and morose.  He'd been at the bar a bit longer than I had anticipated and greeted me with a mere nod.  I said "Happy Birthday, buddy!" and he just grunted "What's happy about it?". 

"What's wrong?"

"Ken, a slacker at 29 is a loser at 30."

Suddenly my lightness was replaced with heaviness and my mood went into a tailspin. I felt like a window in time opened up, showing me myself 5 years later sitting right where he was sitting, thinking just what he was thinking.  What was I doing?  Why was I still in school?  What was I going to do with that hard-earned PhD? 8 months later I had quit grad school and entered the "real" world.

To this day, I remember that little spin my world did at that moment.  Freedom turning into confinement.  Empowerment morphing into disillusionment.  Today, I think of that moment as an inflection point in my life.
Today, Borris is a successful practicing neuroscientist living in Paris and I, well, I have re-invented myself five times since that day (Winemaking in France, Architecture in New York, Engineering in Houston, Importing in Atlanta, Teaching in Massachusetts) and have no regrets.

Sunday, November 24, 2013

Coming up on Thanksgiving and my thoughts turn to...

... Corsica of course!

http://riddicisms.blogspot.com/2009/11/thanksgiving-in-corsica.html

Are the events of that day so seared into my brain that it seems like yesterday or was it the act of writing down the story and reliving it every time I read it that makes me think I remember it like yesterday?

Wednesday, November 13, 2013

Hey You Guys!

I have always felt that the word "guys" is gender neutral despite having been told otherwise by many different people from many different walks of life (I just read an article recently about how a new teacher was put down by a veteran for his over use of "guys" when talking to his class (containing both guys and gals presumably).  Somehow I just can't shake my own usage of "guys" to mean both genders.  However, just recently, I've had a couple of revelation about the word "guys":

1)  My favorite show as a kid was PBS's "The Electric Company" (Morgan Freeman's original role!).  I only recently recalled the show's opener: "hey you guys!" I knew even back then that the show was shouting out to girl fans as well as boy fans!




2)  Guy Fawkes Night.  Ever hear of that one?  I hadn't - but when someone mentioned participating in one this November 5, I googled it to find out what was behind the mask.  Turns out this "Guy" is the origin of the word 'guy'.  We call guys 'guys' because this Guy Fawkes is so famous.  He went from real person to effigies which were made and sold to be burned on Nov 5. to being synonymous with raggedy persons of ill repute to being a general non pejorative term for men to (and I quote webster's online) "used in plural to refer to the members of a group regardless of sex"

Now that is an evolution in usage!  I think I won't beat myself up too much over calling a group of people "guys" any more.  All language is contextual, right, guys?

Monday, November 11, 2013

Brunch Coordinates

A couple of friends with kids were visiting for brunch.  Explaining how their 5 year old was trying to define 'bear', they said he did it this way:
"You know a Polar Bear?  It's like that except brown not white.  Also, it's not polar, just regular."
Being comfortably in the presence of fellow nerds, I chime in: "Ah, a Cartesian Bear then?"

No groans and no confusion, just some chuckles and nods of approval.

Before I feel too witty, I googled an image for this post with "cartesian bear" and apparently this is a common thought.

Aww shucks...

Thursday, November 7, 2013

Making Jokes

So, my usual m.o. in class is to teach for a couple of seconds then make a bad joke, laugh at it myself, point out to the class how funny I am, and then berate them for not appreciating me enough.  Something along the lines of:

"When Newton wrote Principia, no one was forcing him to accelerate mankind's understanding of science." (slight pause) "Get it?  See what I did there?  Forcing?  Accelerate?  I'm funny." (serious students looking perturbed at their learning being interrupted, non serious students annoyed that I might actually think that was funny, and politically savvy students fake laughing).  "Oh - tough audience today."  (Sigh)

So, imagine my surprise when today I inadvertently made a funny while talking about circular motion (the need for a tangential velocity coupled with a centripetal force).  After some off topic remarks by some of the clowns* in the class, I try to bring us back to the physics with a "Usually, I like it when we go off on a tangent, but this is a bit much..."  Then I pause in confusion as they are all groaning and laughing at me.  Then I realize what I had done and promptly said "I gotta blog this."

Am I training them or are they training me?
 

-------------
*This is the same class where one day when they were leaving, I said "Usually, I'm the weirdest person in a room, but in the class, I'm not even in the top five!"

Thursday, October 24, 2013

Analogies Analogies

  As I was going over the equations of motion, I switched from using 'x' for position to 'd' for displacement in the middle of a problem.  This caused a few students to become confused. After explaining that the equations should be read for content and not just followed to the letter, I berated them unfairly by saying "If you are reading a book and the parlor in chapter one becomes a living room in chapter 2, do you stop reading?"
  Later the same day, in a different class, I was warning them that we were going to vectorize our equations of motion and start solving the equations in x and y direction simultaneously...as they all groaned in dismay I quickly interjected "Hey - if you are learning French, you might as well learn German too."  Then we all looked at each other and started to pick apart just how terrible that analogy was, so I quickly modified it to "Hey - once you learn to speak French..." I tilted my head 90 degrees and spoke to them sideways "...you can speak French like this too!"

Inspiried by a Typo

A student in Astronomy accidentally typed the "loves of stars" instead of the "lives of stars".  I thought to myself, Hmmmm....

So here is my response:

We met at first, dispersed and cold
With gravity's love, our fates foretold
We drew together tight and bold

Fusing together, two became one
For 10 billion years, we were the Sun
But eventually our love was undone
We separate: one grew bigger, redder, and colder
Into itself the rest contracted and started to smolder
Alpha alpha alpha, the core grew older and older

Dwarf-like and tiny, merely a carbon sack
I spin and recall when we began to contract
As memories of love fade, white into black

Friday, September 27, 2013

Blast from the Past

One fun thing about a big move is the uncovering of old gems that would otherwise lie forgotten in an obscure corner of the basement.  Check out this 1978 second edition of Dungeons and Dragons.  (this is before the game became a cliché and genre unto itself).
In the same box, I found a user's guide to "Gamma World" and an entire box of Traveller paraphernalia...
Oh yeah, I gots my nerd bona-fides!

Saturday, September 21, 2013

I see with light but I don't see light

I've been teaching light as wave (and then light as a particle) for years, but only last year did the words "We don't actually see light" (as a wave) come out of my mouth.  I then paused and said "but of course seeing light is actually what seeing is".  The class and I looked at each other like we were all deer caught in the headlights.  I think we were all on the same page at that moment in the classroom, but it is a bit linguistically problematic, isn't it?

Every year, at least one student will ask a question that reveals that age-old misconception that comes from our describing light as a transverse wave:  they are trying to picture photons going in a wave-like path on their way from source to sink.  Adding to, not helping this easy-to-make mistake is the classic picture of light as an propagating electric & magnetic field:


Look - there's stuff going up & down  (& sideways!).  This is what we show the students to justify calling it a transverse wave.  But, nothing is actually "going" up or down.  Those arrows represent field intensities getting bigger and smaller (and changing direction) along the central arrow.  This picture assume a relatively sophisticated understanding of vector fields which first year physics student don't have.

A picture is worth a thousand words, but what if 500 hundred of those words are the wrong words?

Nerd Music

Wow!  Music videos that leaves me feeling like I understand the Higgs Boson and String Theory just  a tiny bit more than before!

Saturday, May 11, 2013

Where does mass come from?

One of the many very good youtube channels on physics had a recent episode that tackles one of my favorite subjects:  most of our mass comes from energy:

https://www.youtube.com/watch?v=Ztc6QPNUqls

The bonus in that episode is that the strong force is better explained there than anywhere else I've seen.

For reference, my old post that links to my prezi on energy which is simpler but makes the same ultimate point:

http://riddicisms.blogspot.com/2011/03/prezi-on-energy.html

SMH at SHM

Really feeling the generation gap with my students these days.  Simple Harmonic Motion is a staple of physics and is frequently abbreviated "SHM".  I've been writing that on the board at the front of classrooms for over a decade now.  This year my students tell me they think of "SMH" every time they see "SHM".  Seeing my confusion, they have to explain to me that it is text speak for "Shake My Head".

Hmmm... I wonder if most head shaking can be modelled with Hooke's Law?

Tuesday, March 19, 2013

Khan - Watch Out!

I just discovered a new app that will (in theory) allow me to make Khan Academy style videos.  It's called showme and it's free!  Here's my first tutorial *warning: it's not about physics!

http://www.showme.com/sh/?h=bqPiclM

Monday, March 18, 2013

Tales from Algeria



A young boy, maybe 12 years old, kicks at a stone and looks up at his Pappa.  He wonders why they are visiting the old summer house out of season.  No one is at the sea shore this time of year and the seaside area is deserted.  How is he to know that Pappa is not sure why they are there either except perhaps to address the pit in his stomach that tells him “perhaps, never again.”

“Tell me again why Momma and Sis had to leave?”  the boy asks.
“They are visiting relatives on the continent.”
“But why did they take all the jewelry?  Why did all the other kids leave too?”  Indeed, the boy is proud of the fact that he is the youngest of all the men left in the village.  But his father is deaf to his questions and instead turns back to their car wearing a very sad, pensive expression.

On the drive back, the boy points out a neighbor’s car on the side of the road. “Pappa – I recognize the Schneider’s car!”

Pappa pulls over looking concerned and is scoping out the car without touching it.  After warning his son to touch nothing, the boy wanders down to the riverside.  Looking relieved after a quick examination of the interior of the car, the man straightens up and see his son heading toward something in the river. 

“Roger!  Come back!”  But it is too late, the boy is already poking at the object floating along the edge.  The father sighs and heads down talking to himself “His Mamma is right, I must send him too.”  The boy is poking at a slightly water-bloated cadaver and looks at his Pappa.
“Is this a person, Pappa?”
“Yes – it was, it was.  Time to go.  Time to go.”

A few months later the boy was going to school in mainland France, scuffling with older kids in the playground.  He would wait until he got home to ask his Mamma what a “dirty colonist” was.  He didn’t know why he was fighting, he just knew if someone was calling him that and throwing stones at him then he needed to fight them.

Then, one day a few more months after that, Pappa joined them.  He seemed a different man, a defeated man.  One late night after he should have been asleep he heard him telling Mamma “Thank God for Ehtari. He saved me.  He told the FLN militants while their guns were pointed at us,  ‘No, not that one – I worked with him at the winery – he’s a nice guy. No way he is the one.’ Then he pulled me out of the line and got me to the boat.  I heard the gunfire afterwards and I think the rest are dead.”
“Why did they round you up?”
“They heard that some Frenchman from the village had been roaming with the OAS and shooting Arab women and children.  Apparently I matched the description and so they grabbed me.”
“You and Roger should have left with us!”
“I know, but I couldn’t imagine we would lose it all.  Everything.  The winery my grandfather built with his own hands, the family house, the beach house, and most of our savings.”
“Well, we have the money I sewed into our collars and the family jewels they let me leave wearing. And we have our lives.”
“I know, I know.”

Years later the boy would grow into a man, and run his own, newer winery and tell these stories to his nephew. 
His nephew from America where his sister had gone to make herself a new life in yet another new land. 
That nephew would one day grow into a man himself and think how simple and easy his own childhood in the United States had been.

Thursday, February 28, 2013

Another point for MelodySheep

Okay, I love this stuff, but the secret of the stars is NOT turning energy into mass - it's turning mass into energy!  Every photon of light leaves the star a bit lighter...

Vulcan is NOT a moon!

156913332.jpg

http://www.seti.org/name-the-moons-of-pluto

Okay, maybe it seems cool to name a rock in orbit around the recently demoted dwarf planet Pluto after the homeworld of Spock.  I say "No way! Save that name for a real planet, man!"

"Logic dictates that the probability of Vulcan being a moon is 1.203 percent, Captain!" Or, how about, "Damn it, Jim, I'm a planet not a moon!"

Friday, February 15, 2013

Tastes like...

.. Chicken!

I am often made fun of for my love of chicken. But it's versatile, cheap, and dee-lish! 

Lately I've been pondering the deeper significance and philosophical underpinnings of my joy in eating fowl.  It's really all about our mammalian victory over the dinosaurs.  When that meteor hit central america 65 million years ago, it wiped out the dinosaurs (well, they survive as modern day chickens) and enabled our small, furry ancestors to claw their way to the top of the food chain.  So when I lick my lips at the sight of a whole fryer roasting away in my oven, I am indulging in the revenge fantasy of countless little furry mammalian fore bearers crushed beneath those giant cold-blooded dinosaurs millions of years ago.  I say to mammalian brothers, "Revenge is not always best served cold, but tasty when deep fried as well!"

Saturday, January 26, 2013

Small & Puny; Big & Clumsy

Reason # 47,042 why I love teaching physics:

Where else do you get to say the same thing makes us seem"small and puny" and, later in the same lecture, it makes us feel "big and clumsy"?  The topic is mass and when looking at the primary role of gravity in a cosmic sense we little tiny, short-lived humans seem inconsequential (as we are!) but when we look at where mass comes from and search ever-smaller until we find fundamental particles, we realize we are just too big to able to appreciate how things are stitched together.


Saturday, January 19, 2013

Wedding in Algeria in the 1940's

Found in a box in a closet in Corsica on an old 8 mm tape.  Digitized to DVD, mailed to the USA.  Played on a laptop, filmed by a document camera.  Uploaded to a google drive account, downloaded and then re-uploaded to a youtube.com account... and, now, blogged.

My grandparents' wedding:


Saturday, January 5, 2013

Old Wine, Sour Wine, 21 Day Old Wine




When I worked in the winery, Roger used to keep a container of constantly fermenting vinegar in a dark corner of the winery.  I understood the basics:  by keeping a bacterial culture alive in the container, we could continually drain off some vinegar when we needed some for the home kitchen and occasionally we would top off the container with left over or spilled wine.


However, I never understood the word "vinegar".  Not being much of a French reader or writer, there is a lot about the language I miss. "Vin", of course, I knew meant wine.  "Aigre" is a common word that means sour.  But, somehow, I never made the connection that the French were saying "VinAigre" from which we took our "Vinegar". ("Doh!")
If you know how to read & write Chinese, you already know how to make vinegar! The character on the left means "rice" and the one on the right means "vinegar".  Here's the breakdown for the vinegar character:

Three weeks of bacterial fermentation to take wine to vinegar sounds about right to me.
To write it is to know it!

Testing and "Thinking, Fast and Slow"

Daniel Kahneman has written a (I think) very important book.  I don't really know because I only read his introduction.



However, there was so much meat on the bones in that intro that I returned the book to the library already in order to spend time pondering what he has to say.

Basically, he says the evidence is that when people draw quick conclusions (intuitive?) they are thinking heuristically.  By this he means that we leap to conclusions ("fast thinking") based on a personal probability based on our own personal experiences.  In other word, if the only "Joe" 's you know are plumbers then when you hear about someone named Joe you assume he is a plumber until proven otherwise.  If you are thinking "slowly" (nonheuristically) then you would, of course, know that most Joe's are, in fact, not plumbers and not leap to that conclusion.

This has me thinking about very well prepared, smart physics students who do poorly on conceptual multiple choice questions yet can correctly solve a long, difficult mathematical physics problem that uses those same concepts.  Could it be "fast" thinking on the multiple choice leads them to fall into a cognitive trap made of their own prior misconception and naive intuition about phenomena they have not experienced whereas on the longer, mathematical problems they go into "slow" thinking and use process-oriented thinking rather than heuristic mapping?? Cool...

I have to think about his some more...