Animate History

Author: Administrator  //  Category: Classroom

There is a great contest, sponsored by The History Channel, currently happening, where you can animate transformative speeches from American history.

What a great use of Activsound, to help you record your students voices for this project.  Then you can project and review all their submissions on the board.  You could even do your own class contest where students use the screen recorder tool to animate and record audio from great American speeches.

The deadline for submissions is September 2nd, so get recording quickly!  If you do enter this contest, or create your own classroom contest, go ahead and create a thread for it in the Forum and post your videos there.  I’m sure that others would love to see what your students create!

Make History Speak

Technology Gives Power to the Students

Author: Administrator  //  Category: Classroom

Adora Svitak is an 11-year-old author and presenter who shares her passion for reading and writing with audiences around the world. She uses ActivClassroom technology in her presentations, and is featured in the Planet News story, A Kid’s Eye View of Technology in the Classroom.

Adora SvitakPower to the people! Power to the students!

You may wonder why I declare this. Today’s disenfranchised youth cannot vote; the lower grades cannot drive; we can’t even open up a bank account without adult supervision. In general, minors are not the decision-makers. Where should minors have some control? Education.

When kids of my age are told to do things, we generally are not so excited about doing it. Think in the vein of “take out the garbage” and “eat your vegetables.” When the educator is always at the head of the table, students may not be so apt to eat, or, in other words, to learn.

One of the best ways to get kids engaged in the classroom is to give us some control in our learning experience. I know this first-hand as a student and a teacher. When I teach writing, one of my favorite activities is collaborative writing. Instead of giving each student an individual assignment from the get-go, I instead have students lead the way by suggesting words, characters, and even storylines in response to questions. This gives students a feeling of accomplishment and a feeling of control in the writing process. I use an ActivBoard to show students their ideas come alive in real-time.

As a student, I know how control gets me interested. I attend an online public school, and I am able to learn at my own pace, deciding when to learn what lessons, and where. Although a brick-and-mortar school might have a more standardized approach, there are many ways to get students more involved in the learning process. These include blogs, wikis, interactive whiteboards, and online document sharing.

Blogging

“Writing is the mark you make on the world, and you want to make sure that mark is something you are proud of.” This is one of my favorite mottoes to share with students. Posting student work on a class blog does many things; it makes students aware that they have an audience, and more considerate of the quality of their writing; at the same time, it gives students who want their writing in the spotlight a chance to demonstrate their work. A blog allows students to reach higher levels of Bloom’s Taxonomy, such as analysis, synthesis, and evaluation, through editorials, stories, and essays. A blog could act as a paperless class newspaper, and can be circulated to a wider audience on the World Wide Web.

A blog is also a powerful organizational tool. If you have ever seen the inside of a grade-schooler’s binder, you may reconsider giving them back that masterpiece writing assignment without making an online copy first! The weblog allows you to easily save student work—because even the most eloquent of essays can get lost somewhere in the shadowy depths of a backpack.

Wikis

Another powerful tool is the wiki. Wikis allow a class to collaborate on a project or get more in-depth on a topic. One way to use a wiki is to create a list. A wiki could be used effectively as a site for students to brainstorm ideas for a project.

A wiki could also be used as a writing tool. For instance, if the life science class is learning about the difference between plant and animal cells, the teacher could set up a wiki for a compare-contrast article and write a paragraph introducing plant and animal cells to get the wiki started. Next, Student A could note that plant cells have cell walls and animal cells do not. Student B could add a few lines about how plant cells have chlorophyll. And the wiki goes on. Every student becomes a part of the project.

The ActivBoard, Google Documents

I have an ActivBoard in my home, and I use it every day when I teach schools and classrooms around the world through distance learning. I’ve found that Promethean’s technology has been a big help in giving power to the students. Learner response systems like ActiVotes and ActivExpression allow students to respond to questions without a fear of “standing out.” Interactive flipcharts allow students to take control of the learning process by getting involved in activities on-screen, giving your students more control in the learning process.

I am a big believer in the power of free stuff in general (think dumpster diving), and my philosophy applies to education, minus the dumps. Well-respected online document sharing programs like Google Documents can be excellent collaborative writing tools. They let students exchange ideas back and forth. One plus of using Google Docs is the privacy; Documents only allows those people who have been approved by “Collaborators” to contribute to a piece of writing.

Not only do these technology options give your students control, they are all fairly user-friendly and do not require too much technological expertise. Although technological expertise should not be something you—or your 21st Century students—are lacking in.

Graduate junction

Author: Administrator  //  Category: Science

I recently found out about yet another “social network”, with a difference. For all the readers of this blog who might be graduate students or post docs, here’s a new resource for you.

The graduate junction is a networking resource for early stage researchers, who might be doing their masters, Ph.D. or post doctoral research work in Mount Doom (or whatever else you call your research group). It seems to be a nice, focused resource, with sharing of resources,a good discussion forum, indexing by category of your research, a database of conferences around the world, useful resources (particularly useful writing resources), some fun (a crossword), and much more.

If you are a young researcher still working on your thesis or a postdoctoral fellowship, you might find this useful. It is still work in evolution, but I think it does serve a specific need, and there aren’t too many resources for young researchers out there.

Fly’s Flat Faces

Author: Administrator  //  Category: Maths

A fly has been buzzing around my office room for the last couple of days. It navigates its way from corner to corner, lamp to telephone, computer monitor to my nose, and from window to mirror. It astutely steers its way around chairs and speakers and bedposts and guitars. It often descends quickly and appears to instantaneously land on some object. Watching it for a while, the fly seems pretty smart. But then, without warning, it will, with great speed, crash head-first into the window or the mirror.

Two things are odd about this behavior.
1. Why, when advancing directly into the mirror, the fly doesn’t see its reflection, think there is another fly coming right at it, turn to avoid it, and avert the crash into the mirror.
2. Why, after smashing its head into the mirror once, the fly continues to smash its head into the mirror over and over and over again.

Although I am curious about the answers to both these questions, I am more interested in why the head-crash into the mirror does not flatten the fly’s face.

My plan is to devise an experiment from which I will use the quantitative results to mathematically derive the solution to this “non-flattened fly’s face” mystery (nf^3 for short).

I believe the mathematics will involve the concepts of

1. momentum, which involves the fly’s mass and velocity
2. impulse, which involves the change in momentum
3. conservation of momentum, which involves external and internal forces acting on the fly
4. coefficient of restitution, which is the tendency of a body to return to its normal shape once it has been deformed, which involves the elasticity of the fly’s head.

I hope to obtain the pertinent values through an internet search.

I tried to obtain the linear velocity of a fly experimentally, but without success.

The following video shows the result of my attempt to measure a fly’s linear speed.

I snatched at fly off a loaf of bread I keep by my computer to snack on. See Figure 1.

Figure 1  Loaf of BreadFigure 1 Loaf of Bread

I took it outside to the street where I had set up a 1000 foot linear trajectory which I had fitted with two atomic clock to measure the fly’s time over the 1000 foot linear course. See Figure 2.

Figure 2Figure 2

The experiment did not go as planned. Although I thought I made it clear to the fly that it was to proceed directly in a straight path from Clock A at the beginning of the course to Clock B at the end of the course, it did not do that. It veered off to the left into the bushes and disaster. See Figure 3 and the video which follows it.

Figure 3Figure 3

That experiment didn’t work, so I checked for fly flying speeds on the internet. I found various speeds in a classical calculus problem. See Problem 1.

Problem 1: Two trains 300 miles apart are traveling toward each other along the same track. One train travels at 60 miles per hour and the other train at 90 miles per hour. A fly buzzes back and forth from the first train to the second train until the trains collide. If the fly’s speed is 20 miles per hour, how far will the fly travel?

This problems lists the speed of the fly at 20 mph, while other versions of the problems listed speeds of 60 mph, 100 mph, and even 120 mph.

I choose to use the more reasonable 20 mph speed. For my computations, I will assume the fly crashes head-first into the mirror at 20 mph. My question is why, flying directly into the inelastic surface of a glass mirror, the fly doesn’t bounce off with a flat face?

I posed this question to two of my mathematician friends, Guy and Wade. They both agreed that crashing into a hard surface at 20 mph would flatten anything’s face. See the Before and After pictures of Guy and Wade in Figures 4 and 5.

Figure 4  Guy and Wade before demonstrationFigure 4 Guy and Wade before demonstration
Figure 5  Guy and Wade after demonstrationFigure 5 Guy and Wade after demonstration

They are both okay now and look just as good as they did before their test crash.

After this clever demonstration, I think it is very possible that fly’s do flatten their heads when they smash into a mirror and maybe that is why they just keep doing it again and again.

Exercise: How far does the fly in Problem 12 travel?

Answer: The fly spends the same amount of time traveling as do the trains. The trains are traveling at 60 mph and 90 mph hour toward each other, so their combined speed is 150 mph. Then, since

distance = rate x time, or

\begin{array}{clclcl}<br /><br /> d  &= r \cdot t   \\<br /><br /> t &= \dfrac{d}{r} \\<br /><br /> t &=\dfrac{300}{150} \\<br /><br /> t &= 2<br /><br />  \end{array}

So the trains travel for 2 hours. The fly travels 20 miles in one hour and it travels for 2 hours, so in the 2 hours the fly will travel 2 \cdot 20 = 40 miles.

SLES / SLED 10 with Intel 965 Graphics

Author: Administrator  //  Category: Linux

If you need to update your installation to work with Intel graphics, there is an RPM you can install that will likely resolve your issues:

http://download.opensuse.org/repositories/home:/mhopf:/hp/SLE_10/i586/intel-i810-xorg-x11-6.9.0.2-8.1.i586.rpm

Install that, then run Sax or edit xorg.conf, and make sure to pick the i810 driver. (This post is in response to the number of forum posts on this subject offering no solutions)