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Benjamin Stein, technical manager at Mobile Commons, talks about the “worst bug” that he has ever encountered. It happened once Ben changed his iPhone for an Android. Soon, he noticed that he is not receiving most of the messages from his contacts – other iPhone users.

As it turned out, when his friend attempts to send a message, their iPhone instantly sends it as an iMessage as their cache memory recognizes his number as one that supports iMessage. Naturally, his Android device does not receive the message.

Advanced users may realise that they should send the same message again in the form of a simple SMS. However, in the case of Group iMessage there is no such option, hence there is absolutely no way for the addressee to receive the message. The sender remains uninformed that the message was not received.

Stein deleted his iCloud, iMessage and FaceTime accounts from all devices and from the website. He demanded that tech support withdraws his certificates, so that he would not be able to log into the system even if he wanted to. In other words, the servers have no record of Benjamin. Nevertheless, the cache memory on the mobile devices of other users will always recognize Benjamin as an Apple user.

Benjamin contacted Apple tech support and said that they persistently tried to fix the problem, but there was nothing they could do. The company's official position on this topic was that every individual subscriber, whom Stein has contacted during the past five years, must personally delete the iMessage chats with him. Obviously, this is unrealistic.

It seems that Apple is creating additional barriers and obstacles for users who want to leave the homogenous infrastructure. Perhaps the company does not even acknowledge this functionality as a bug because it is quite rare for a user to leave the Apple infrastructure.
“I have an absolute feeling like I am a hostage,” says Benjamin Stein. “They have no solution for this problem and it is absolute madness that Apple holds my phone number hostage and I cannot get it back.”
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Web Development

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One of the users of StackExchange asked a question, which at first glance may look weird: why is the mouse cursor slightly tilted and not straight? Indeed, why the cursor is not vertical?

Vertical mouse cursor

The answer was given by an expert, who is familiar with the history of computer hardware. He confirms, that initially the mouse and therefore the mouse cursor invented by Douglas Engelbart, was an arrow pointing up.

However, graphical interface for the first operating system in the world was designed by Xerox, precisely — the Palo Alto Research Center. The mouse cursor was described in a document, which lists all of the specifications of XEROX PARC, the first computer with graphical user interface. It was found that, given the low resolution of the screens in those days, drawing a straight line (left edge of arrow) and a line at a 45 degree angle (right edge of arrow) was easier to do and more recognizable than the straight cursor.

Palo Alto Research Center

These days, the tradition is being kept alive despite high-resolution displays we have and huge technological progress in general.
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The main motive for the creation of the microscope was the struggle against malaria — in the developing countries about a billion microscopic examinations of the blood samples per year have to be carried out for malaria diagnosis. A standard laboratory microscope is an expensive and fragile device. Stanford scientists have managed to construct a microscope with magnification up to the 2000x, while the cost of all the components in a mass production will be 97 cents. The microscope body is cut out and folded from a sheet of thick paper. Other components are a flat battery, a LED switch, a piece of conductive copper tape and a glass or a sapphire ball lens.

Paper microscope fits easily in your one's pocket, weighs less than ten grams, can be used for brightfield, darkfield, polarized and fluorescent microscopy, and even work as a projector. One battery lasts for 50 hours. Microscope can easily endure pretty rough usage, it can even be stepped on, it can be dropped on the floor — it can withstand anything that a piece of cardboard can withstand. The quality of the microscope image is sufficient to determine various types of infections in outdoor conditions.

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