Test. Please delete
It's a very popular game on your computer.
WarriorTeacher34, you make a good point. Sometimes it's convenient for the teacher to set a password and e-mail for everyone, then let students customize it (so that they have their own password, say). But i can also see your point where that may lead to problems (such as them forgetting their password).
We will think more about this, and perhaps introduce a choice for teachers when setting up the classroom. If you have more thoughts let us know.
These do different things - bar codes are strictly for shopping checkout, QR codes can initiate all kinds of actions on mobile phones (web site, play video, etc),. RFID is used for all kinds of things - warehousing etc. But you're right - it may be enough to use one of them in shopping checkout.. but these technologies evolved at different times, and sometimes they are expensive to replace
good question. Both in bar codes and QR codes, there are millions of possibiities - because each bar (or pixel) can be different. Of course, just like with telephone numbers, at some point they'll run out of unique codes. But at that time, they can just increase the size of the code..
excellent idea. we'll be doing that soon!
alicej, the security in these buildings is usually very tight. If there's a terrorist attack, then it's possible the data center could be blown up. But Google and Facebook are very clever - they store the same information in multiple data centers - so if one data center goes down (due to an earthquake or terrorist attack), the other data center (located in another part of the country or the world), can take over!
karlyg, the data on the computers is "encrypted", so anyone stealing the machines will not be able to steal any information. Though, of course, maybe they can sell the machines and make some money.
T-bone, there's a lot of security in the data center, even though noone's inside. Also, the data is "encrypted", and hard to copy.
waterg, thanks for pointing that out. The map was saying Seattle because Microsoft, the maker of Kinect is in Seattle. But we changed it to Toronto, Canada, which is where Sunnybrook Hospital is!
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Very astute of you to spot that! The minimum number of satellites needed for PGS tracking is 24, the rest are "spares" - they take over if there's a temporary failure with the first 24.
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