Crucial Thought Rss

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Chris selected as K12OnlineConference keynote speaker Each year the K12OnlineConference provides tremendous professional development for free, and entirely online. This year, they have selected me as one of their keynote speakers. I am thrilled to have been chosen and look forward to participating in the conversation. Read the full post announcing all the keynote speakers here.

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Two quick links on Cognitive Load Theory I've been fielding lots of questions lately about Cognitive Load Theory. Here are two quick links that may be useful. First is an article talking about the practical implications of CLT on the design of learning. The second are some "recent" (as of 2003) developments regarding CLT. Happy reading! Update: I clarified the second...

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Practical advice on kids and Android app development After hearing about my students' success developing an Android app, I've gotten several emails asking for more details as to how I practically worked with my kids. Here are some pointers that I offered to the first person that emailed me, perhaps they are of some use to you. Please note that your mileage may vary. It's ok to not be...

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Publishing an App Inventor app to the Android Market As I mentioned earlier, my students and I published an Android app to the Android Market. See those links for more information on the background. This post is decidedly technical. First, once we finished the coding process, we packaged the app for to download to the computer. This is an option in App Inventor. This downloaded an .apk file....

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Designing and publishing an Android app with kids This post is designed to provide some context around how/why we decided to build this app. The more technical details of the code and how we published it will come in a future post. My students and I recently completed and published an Android app, and here's how we did it. First, the genesis for this goes back to a question I asked...

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Advice from iPhone owners

Category : General

Hey iPhone owners,

I’m curious about something.

I have an iPod Touch and it is driving me crazy. It may be the reason I do not get an iPhone. Here’s my issue…

How do you keep the darned screen clean?

It’s more than cosmetic, it keeps me from typing. There are times I want to type a letter t and cannot because I have been navigating, playing, or what have you, and there are enough built up fingerprints there that it blocks the letter. I can roll right over it and it never registers. I rub it on my jeans, shirt, hot breath cleaning technique and nothing. I power it down, all the way, and still nothing.

I end up having to use some sort of cleaner (approved for the device, thank you) and let it sit a while.

How in the world do you prevent this from happening? It would be detrimental if I wanted to send an email and could not. It’s kept me from twittering many times, and I’m not sure that’s all bad.

Ok so help me out here, eh?



Comments (3)


My started like that and eventually got to the point where I couldn’t get the screen to respond at all. I’m anxiously awaiting my replacement Touch right now. From what I could find on-line, it is not an uncommon problem. Applecare is a great thing though.


I have an iPhone and had the same problems at the beginning. I don’t use make-up and don’t have “greasy” skin either, but the surface felt horrible. I then bought a special screen overlay at the apple store and never had to clean it since then (last April)! That worked for me.


I bought the static cling scrren overlay too – it works great. I was worried that it would slow the touch screen down, but the difference isn’t noticable.