Tag Archives: Technology

News, Technology Review

Designing a Smart-Phone Alphabet for the Illiterate

On the road to Chennakeshavapura, a helpful sign on a stone identifies the village as CK Pura for short, but that message is lost on many illiterate residents. For them, reading and writing matters less than channeling enough water to their fields and growing enough peanuts to ride out the drought years.

In 2007, Swiss computer scientists and Indian agricultural scientists offered to install wireless sensors in the peanut fields at CK Pura and collect data the farmers might find useful for improving their yields. There was just one problem: few of the farmers could read the recommendations.  Continue reading Designing a Smart-Phone Alphabet for the Illiterate →

News, The Economist

Dispatching the middleman

MANY cabbies pay a dispatcher to keep the fares coming. The dispatchers are an information clearing-house, offering customers a central point of contact and offering on-the-move drivers directions to the nearest prospective passenger. But location-enabled smartphones in the pockets of more customers, and on the dashboards of more drivers, offer a tempting way to skip the middleman. If, that is, customers and drivers can find a handy way to share their locations.

Enter the app developer. In Sweden, Germany, Spain and Britain this new breed of middleman has released a slew of taxi-finding apps in recent years. When a customer requests a taxi, the applications ping the nearest available driver. He can accept the fare, paying a small commission, or skip it. Some applications offer customers an estimate of the fare, ratings of potential drivers or, once a match is made, a moving blip on the map, showing  their drivers’ progress. All this is especially useful for visitors unfamiliar with a city or late-night revellers uncertain of their street address.

Continue reading Dispatching the middleman →

News, The Economist

Signs of progress

WHERE the internet has yet to take firm root, people plump for the next-best thing. In many emerging markets this means text messaging. Customers have embraced the short message service (SMS) not just to communicate with each other, but also to get weather forecasts, bus schedules and traffic information, or to vote in television talent shows. Authorities use it for public announcements. Companies text targeted advertising. India even has a rudimentary SMS-based social network.

The reason texting isn’t even more popular in such places has to do with the fact that—despite indignant claims in some quarters that texting is killing literacy—texters must be able to read and write. Continue reading Signs of progress →

Lucerne, New Scientist, News

Sounding out cancer cells

A device that filters cancer cells from human blood using sound could help to identify tumour cells that have spread.

Finding tumour cells in the blood indicates a cancer has metastasised – but the molecular markers that are used to identify the cells can modify them and make them unsuitable for studying how treatment is proceeding and for performing basic cancer research.

So Itziar González at the Institute for Acoustics in Madrid, Spain, and colleagues developed an alternative: a tiny vibrating plastic chamber through which a blood sample flows. The vibrations create a standing wave that deflects cells in the blood to a different degree depending on their size. Tumour cells are often larger than blood cells and so collect in a different region of the device. The process does not alter the cells. Continue reading Sounding out cancer cells →