Medical technology: is CT scan the same as CAT scan?

Curiosity has led to self-tutoring: the tutor discusses the two terms CT scan and CAT scan.

CT scan and CAT scan have the same meaning. CAT scan is the older term.

CT stands computerized tomography, whereas CAT stands for computerized axial tomography.

Tomography: a method to produce pictures of internal body structures. Tomography acquires information from many cross-sectional scans.

Computerized tomography conveys the idea that, once the cross-sectional scans have been taken, a computer program is used to produce an image from their data.

In the phrase computerized axial tomography, the word axial refers to the idea that the cross-sectional scans are taken by revolution around a common axis (axis=line). Specifically, a scan is taken around the patient, then another a short distance along, and so on.


Jack of Oracle Tutoring by Jack and Diane, Campbell River, BC.

Lifestyle, mobile phones: phone cases

Perhaps lifestyle requires more tutoring than anything else – for me, anyway. The tutor relays his experience phone case shopping.

Yesterday I got schooled on how to buy phone cases. I’m interested to share what I’ve learned.

We bought my son a phone that’s been out a couple of months. It’s an Android, a very good phone, but not flashy or brandy.

At a big-box store the clerk told us that, with more generic phones, cases are easier to get from a dedicated phone case seller. The big box places might stock cases for prominent brands and makes, but there are many others that they might not cover very strongly.

Therefore, we went to a kiosk in the Woodgrove Centre mall in search of a case for my son’s new phone. The kiosk is near Boathouse. We didn’t even have his phone with us – no problem. The attendant knew which one it was, and that it had been out for only two months. He had a few choices, including wallets. He also had screen protectors.

I chose a wallet case for my son’s phone, and also got him the screen protector. The attendant wanted to put the screen protector on for us, and told us if we brought him the phone, he would.

Just for kicks and giggles, we asked if he had a case for my phone – a Nexus 4. “Nexus 4?” he repeated. He uncovered a storage box, dug in, and pulled one out. I bought it. Here is my Nexus 4, in its new amazing case:

Jack of Oracle Tutoring by Jack and Diane, Campbell River, BC.

Web design: Div border on mobile phone: a possible solution?

Tutoring web design, mobile phones have their own demands. The tutor attempts to please them.

In yesterday’s post I discovered a border that showed up on my desktop but not on mobile.



Apparently the border-width needs to be set for a mobile phone to show it. This one is set to 2px.



Jack of Oracle Tutoring by Jack and Diane, Campbell River, BC.

Biology, Lifestyle: food preservation by irradiation

Tutoring biology, you might be asked about food irradiation. The tutor briefly talks about it.

Food irradiation is a preservation method that exposes food to radiation to kill organisms that might cause spoilage.

A question I had was, “Why doesn’t irradiation damage the nutrients in food?” From reading, I’ve surmised that the radiation separates the organisms’ DNA into building blocks, rendering it useless (so that they mostly die or just can’t reproduce). However, those building blocks are still useful as raw materials to whoever consumes the food – that’s as I understand, anyway.

Food irradiation has been an accepted technique for decades; the US space program has used irradiated food since the 1970s.


Jack of Oracle Tutoring by Jack and Diane, Campbell River, BC.

Home computer use, technology: what is BitTorrent vs direct download?

Understanding home computer use might involve constant self-tutoring. The tutor explains BitTorrent, as he understands it.

With direct download, your computer receives a resource from a server.

With BitTorrent (protocol), your computer receives a file that contains the locations of other computers that contain the resource, or perhaps just parts of it. Your computer can then request parts of the resource from those other computers until eventually it accumulates the entire content.

The thinking behind BitTorrent is that receiving the resource, in pieces, from many computers at once might lead to a faster download. Moreover, the draw on the original server is less, since other computers that have received the resource can then share it.

Good BitTorrent citizenship means you upload as much as you download. Apparently, you can choose a BitTorrent client that keeps track; when they’re equal, you can (ethically) remove that resource from your BitTorrent client, knowing you’ve shared appropriately. There are numerous BitTorrent clients (programs) available; to participate in BitTorrent, the user needs first to load one.

PS: There may also be a specific client for BitTorrent protocol that is, itself, called BitTorrent.


Jack of Oracle Tutoring by Jack and Diane, Campbell River, BC.

SEO: how to depersonalize search results on Google

Tutoring web marketing, you might come across the idea of personalized search. The tutor delves into the world of SEO.

SEO – search engine optimization – is, to my understanding, the tailoring of a website to gain search presence.

Since search results can alter depending on a device’s search history, the question can arise: “What do other people see when they type in that query?”

Of course, one way to do a search unprejudiced by your own history is to use a different device. Apparently, another way to depersonalize search on Google is as follows:

  1. Search the query on Google like normal.
  2. Then, at the end of the search string that is returned in the query box, type &pws=0.
  3. Press Enter to repeat the search, this time with depersonalized results.


Jack of Oracle Tutoring by Jack and Diane, Campbell River, BC.

Home computer use: how to identify a usb 3.0 port, or presence of usb 3.0 capability

Home computer use means constant self- tutoring. The tutor shares a couple of clues about detecting a usb 3.0 port.

I’ve heard that usb 3.0 ports are meant to be blue inside. However, I’ve also heard that some usb 3.0 ports may not be marked blue.

Next to the port, the letters SS can also mean that the port is usb 3.0, even if not blue inside.

Some computers have both usb 2.0 and usb 3.0 ports. Apparently, a way to tell if usb 3.0 is present or not is to go into System Information, then Components, then USB. As I understand, USB 3.0 suggests its presence.



Jack of Oracle Tutoring by Jack and Diane, Campbell River, BC.

Home computer use: security: Bitdefender Safepay

Using a PC can involve constant self-tutoring. The tutor shares his discovery of Bitdefender Safepay.

As I’ve come to understand, Bitdefender Safepay is a secure browser that can be invoked from the Bitdefender suite (I have, I believe, Bitdefender Total Security). The idea is that you can browse with Safepay (as opposed to your regular browser) for extra security.

While Bitdefender Safepay might mainly play to people doing transactions online, it can be used as a general-purpose browser. For sites you log into, like blogs or membership sites, (as well as, of course, transaction situations), it offers a virtual keyboard through which you can enter the credentials. Using the virtual keyboard protects against keyboard-monitoring malware.

I like Safepay as just a regular browser; I don’t do much in the way of transactions, but I do log into blogs, membership sites, etc.



Jack of Oracle Tutoring by Jack and Diane, Campbell River, BC.

Computers: why flash drives aren’t vulnerable to magnets (supposedly)

Tutoring, you see flash drives carried around with anything stored on them. The tutor shares some findings about them in relation to magnetism.

I recall holding a flash drive with a magnetic lid, and wondering how it could be so.

Apparently, flash drives hold information using electric charges, rather than magnetism. Two websites tell me that, for that reason, flash drives are not changeable by magnetism – at least, not under normal conditions.

Magnetism and electricity are related. Specifically, a changing magnetic field (for instance, as the magnet moves nearby) can cause voltage in a loop of wire. Therefore, I wouldn’t experiment with a flash drive near a magnet if the data was important.


Jack of Oracle Tutoring by Jack and Diane, Campbell River, BC.

Windows 7: turning computer off from the keyboard

Tutoring computer usage, this shortcut might be important. The tutor tells how to shut down using a keyboard shortcut.

In yesterday’s post I mention my old screen failing by going black. Since I could only see the desktop for 2 seconds at a time, I needed a way to turn off the computer that didn’t use the mouse.

I have two Windows 7 computers. On one, the shortcut to shutdown is Window Key (the four-paned banner, next to Alt), then right arrow twice, then Enter. On the other one, it’s simply Window Key, right arrow, Enter.


Jack of Oracle Tutoring by Jack and Diane, Campbell River, BC.