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The premise of the work is simple — get to know your potential customers as well as possible before you make a product for them. But when those customers live, say, in a mud hut in Zambia or in a tin-roofed hutong dwelling in China, when you are trying — as Nokia and just about every one of its competitors is — to design a cellphone that will sell to essentially the only people left on earth who don’t yet have one, which is to say people who are illiterate, making $4 per day or less and have no easy access to electricity, the challenges are considerable.

Text messaging, or S.M.S. (short message service), turns out to be a particularly cost-effective way to connect with otherwise unreachable people privately and across great distances. Public health workers in South Africa now send text messages to tuberculosis patients with reminders to take their medication. In Kenya, people can use S.M.S. to ask anonymous questions about culturally taboo subjects like AIDS, breast cancer and sexually transmitted diseases, receiving prompt answers from health experts for no charge.

A cellphone in the hands of an Indian fisherman who uses it to grow his business — which presumably gives him more resources to feed, clothe, educate and safeguard his family — represents a textbook case of bottom-up economic development, a way of empowering individuals by encouraging entrepreneurship

If you invited me to try and crack your password, you know the one that you use over and over for like every web page you visit, how many guesses would it take before I got it?

One of the simplest ways to gain access to your information is through the use of a Brute Force Attack. This is accomplished when a hacker uses a specially written piece of software to attempt to log into a site using your credentials.

And how fast could this be done? Well, that depends on three main things, the length and complexity of your password, the speed of the hacker's computer, and the speed of the hacker's Internet connection.