Day: 9 October 2007

This message will disappear in 24 hours

Scientists at Xerox have developed an ink that will disappear from printed paper in 24 hours, allowing the paper to be reprinted and reused again. The ‘disappearing ink’ is actually not an ink at all, but a temporary discoloration of light sensitive molecules known as photochromes. A sheet of paper is coated with these molecules (on both sides) which change color in response to ultraviolet light. After printing, the ‘ink’ starts to revert back to its natural state due to heat provided by the surrounding air. The paper itself is no more expensive than a regular page, costing about 0.5p per sheet.

The technology, which will not be commercially available for several years, will reduce the amount of energy required to print a single page by a factor of 200 – from just over 200kJ (which would power a 75W light bulb for an hour) to 1kJ (which would power the bulb for just 18 seconds), Mr Smith said. A recycled page uses about 110kJ of energy.

Talking on the Phone is Healthy

A recent study that set out to lower the risk of heart disease and strokes in people predisposed to have them by talking to them over the phone. The patients received health “report cards” letting them know how they’re doing. Based on the report cards a kinesiologist would talk to the patient about their health. The results appear to be positive!

Andrew Lister, one of the study’s authors and chair of the gerontology department at Simon Fraser University, said the study was also meant to act a model for a community-based health-care program that could be implemented at a fairly low cost to lower a population’s heart and stroke risks.

The intervention consisted of a health report card that was sent to the participants and their family doctors. This included a profile of risks such as high cholesterol, systolic blood pressure, diabetes and smoking status. Physical activity, body mass index, waist circumference, nutrition status, stress level and health confidence were also factored in.

The other component of the intervention was a telephone discussion between a lifestyle counsellor — trained as a kinesiologist and well-versed in cardiovascular disease prevention — and the participants. Two kinesiologists performed all 611 interventions.

“Two people did it all, one full-time and one part-time,” Lister told CBCNews.ca on Friday. “You could reach a lot of people if you were doing this on a continual basis.”