Category: Nature

The Great Bear-Off

December 19, 2014

And so we begin the second half of

This is hard work you know! I hope everyone is enjoying the marathon of posts 🙂

The above is a photo taken from Bernard’s blog. He is, as we all know, a master of origami. If you’re unfamiliar with his talents, refresh your memory with some examples of his skill.

But I bet you didn’t know that he was once the student, and I the master?

It’s an undisputed fact that, way back in the days of yore, my brother’s interest in origami was ignited by my very own passion for paper folding. Indeed I was so proficient that people ~~never~~ used to call me ‘The Wizard of Whitebridge‘. In those days I could fold boats and hats and even a crane like a savant.

However I let my talents slip, and haven’t folded in quite some time. I started to wonder: could I still do it? Was I still a master, a wizard even? It was time to find out!

But what to fold? Well here’s where my buddy SFL enters the picture, since she suggested ‘bears’ as a blog topic for this 12-day marathon. Even though she may have been deliberately trying to sabotage me (bears?!?!?!?) all of a sudden it was clear: I would fold a bear!

The rules were simple: make an origami bear without consulting any pattern and instead using a fold that was completely and originally my own. I chose gold paper and started folding, using just the plans in my own head.

There was lots of pre-folding and scoring and initially it started to look more like a boat (or hat) than a bear. But that was not a problem, since I was once the god of folding paper hats! As I continued with my 100% original pattern, I ran into some difficulty when I got to a step that required a type of fold I chose to name a ‘petal fold’. But I soldiered on, and managed to complete the folds by myself and entirely without the assistance of a calmly-spoken Englishman and his channel of origami videos on Youtube.

You can see by this point I was being guided simply by the vision on my own mind, and the paper had started to resemble a bear! To allay the stress, I watched some completely unrelated videos on my iPad as I folded.

The entire process took maybe an hour to finish. I’m proud to say I did a wonderful job, and here is the result:

Magnificent isn’t it! A beautiful golden sun bear, that looks absolutely nothing like a pig! Critics may claim that the choice of paper size suggests the actions of a rank amateur, and that some of the folds leave a bit to be desired. But I can assure you they were intentional, as if to suggest ruggedness and victory against the forces of the wild.

Here’s another artistic shot of my superb creation that doesn’t look anything like a swine:

So as to compare against my skills, I asked my brother to fold a bear as well. He made some blathering claims of not having enough time and not having a suitable pattern, but this morning I received his version accompanied by the comment: “Best I could do given the short notice“:

…

He’s just showing off now isn’t he?

Ferrofluid

November 18, 2014

One way to imagine magnetic fields is by drawing lines showing the direction a compass would point if placed into the field. Here’s an example:

The black lines depict the magnetic field directions. This can be hard for students to understand at first, so another technique is to show the field lines by placing iron filings near a magnet and watching them align themselves in the direction of the field, like this:

The black bar is the magnetic. These sorts of demonstrations can be artistic:

And given enough filings can even show the field in 3D:

But the best illustrator of the field, in my opinion, is to show the effect of the field on a liquid. ‘Ferrofluid’ is the name of a magnetic liquid invented in 1963 that suspends micron-sized iron nanoparticles in a viscous fluid. This allows them to flow as if they are a liquid, and leads to striking displays of magnetic fields like this:

The magnet in the above picture is underneath the bowl containing the ferrofluid.

I’ve been using images like all of the above in class for years when I introduce the magnetic field and when I found out last week how easy it was to actually purchase ferrofluid (which is toxic and can apparently stain anything) I just jumped at the chance. Here’s what my new bottle of ferrofluid looks like:

Just some black oil in a bottle isn’t it? The bottle is filled, most likely with pure water. The fluid is likely oil filled with the iron nanoparticles, and is extremely viscous and doesn’t mix with the water. It’s quite unremarkable by itself, but becomes something quite special when exposed to a magnetic field.

Here’s a short video I just made (it’s in HD, so fullscreen it if you like):

Wonderful isn’t it? This will stay in my office with all my other demonstration units, and I’m sure it will give students and my coworkers many smiles!

The Great Australian Road Trip

July 15, 2014

One day I’m going to drive around Australia. And I don’t just mean here and there, I mean drive all around Australia. As in this:

It’s a trip of almost 20,000 km, or over 200 straight hours of driving at 60 mph. That’s 40 days of driving 5 hours a day, which means this would be lengthy and expensive. But what a trip it would be!

I’d do the reverse route from the map above, starting in Sydney and heading north through Newcastle, Brisbane and all the way up to Cairns. That’s a few days right there, with many stops and things to see on the way. The beaches and coastal roads, especially as you get more and more north, would be beautiful.

And then a several-day trip to Darwin through the outback. Hundreds and hundreds of dry empty miles with not even a radio station on the radio. That would be quite an adventure!

The Darwin to Perth leg may take a week. It’s some of the least inhabited parts of Australia, but there are just enough small towns to make a daily stop possible. Accommodation on this leg may include a tent, or sleeping in the car! I may stay in a comfy hotel in Perth for a day or two to reset 🙂

Half the trip would now be complete and I’d be on the opposite side of the country. But the southern coasts are still to come, and some say these are the most beautiful roads in all of Australia.

It may take a week to get to Adelaide from Perth, stopping everywhere that looks interesting. Between the desert and the southern ocean there would certainly be a lot to see!

And then the windy roads along the Victorian coast would take me to the extreme southeast, at which I’d have to make a decision: Tasmania or no Tasmania? After 5 weeks on the road, who’s to say what I’d decide at that point?

Eventually the landscape would become vaguely familiar, as I drove into NSW and found myself within a few hours of Sydney. Six weeks after starting, I’d reach my destination: exactly where I started.

I’d have seen the entire country, and made enough memories to last me forever.

I’ll do this one day. I have to. Who wants to come with me?

Robot Claw