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If I have to pay to view a channel on YouTube, this is going to be ridiculous.

29 February 2012 Last updated at 01:17 ET A credit-card sized computer designed to help teach children to code has gone on sale for the first time. The Raspberry Pi is a bare-bones, low-cost computer created by volunteers mostly drawn from academia and the UK tech industry.

I've heard about this before. It sounds like an interesting idea.

In the never-ending arms race between secret-keepers and code-breakers, the laws of quantum mechanics seemed to have the potential to give secret-keepers the upper hand. A technique called quantum cryptography can, in principle, allow you to encrypt a message in such a way that it would never be read by anyone whose eyes it isn't for.

A great video detailing how Huffman trees compress text. Very insightful into one method of data compression; something we often take for granted.

The new system repaired nearly twice as many bugs as the best-performing hand-coded template system.