This morning, Google announced that it will be acquiring reCAPTCHA, a company devoted to putting the few seconds you spend solving CAPTCHAs – those funny puzzles you fill out on Ticketmaster and other sites to verify that you’re human – into good use. As announced, Google will integrate reCAPTCHA’s technology into its own spam and fraud countermeasures, and will use the human output of those puzzles to advance its Book Search and Newspaper Archive scanning efforts.
One of my first posts on Tropophilia profiled the founder of reCAPTCHA, Luis von Ahn, and his efforts to harness otherwise-wasted human effort. Given today’s announcement, I thought it made sense to repost it in order to put into context this acquisition and the “spare cycles” philosophy that it engenders.
Disclosure: I am an employee of Google. I was not an employee at the time this post was originally published. All views expressed in this post are mine alone, and do not necessarily reflect those of Google.
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“Spare Cycles: Distributing Computing Among Machines and Minds” - published January 19, 2008.
A few weeks ago I read an article in The Economist about distributed computing, defined by Wikipedia as “a method of computer processing in which different parts of a program are run simultaneously on two or more computers that are communicating with each other over a network.” Basically what you do is download a program that, when you’re not around, uses your computer’s processor (which would otherwise be mostly idle) to crunch data sent to it from a central server. Your computer joins thousands of others crunching data at any one time, forming a giant networked supercomputer with each unit working on a different piece of the puzzle.
What’s the puzzle? It can be anything, or at least anything that requires a whole lot of computer power to figure out. Some puzzles are humanitarian in nature; for example, the World Community Grid (sponsored by IBM) currently has projects tackling cancer, AIDS, and Dengue fever research, as well as African climate change. Others are more geeky (or, should we say, scientific), like the SETI@home project which is searching for extraterrestrial intelligence by analyzing radio telescope data.
So the bottom line is this: while one way to save the planet and contribute to science is through the donation of time and money, another way is through the donation of your computer’s processing power. Why let your computer idly sit while you’re at work or school all day — occasionally using a small processor burst to throw the next picture from your hard drive onto your screensaver, which no one but your dog is watching — when you can have it use its full capacity to solve some of the world’s toughest problems?
The buzz word for this phenomenon is “donating spare cycles.” Basically, a cycle is the process your computer goes through to retrieve a command from its memory and execute that command. It’s how your computer works and, in a way, it’s how our minds work too. A human cycle, then, would be the process our brain goes through to retrieve and process information from our memory. But do humans have spare cycles to donate? You bet.
Continue reading ‘From The Archives: reCAPTCHA and Spare Cycles’

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