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For every year a person is homeless, the odds of them having a family doctor drop by 9 per cent, according to a report by St. Michael's Hospital and Street Health.

A device the size of a deck of playing cards that can track temperature, humidity, light and barometric pressure is moving from the shipping world to the realm of research to help develop a better understanding of how the climate is changing.

Scientists today claimed one of the milestones in the drive for sustainable energy - development of the first practical artificial leaf. Speaking here at the 241st National Meeting of the American Chemical Society, they described an advanced solar cell the size of a poker card that mimics the process, called photosynthesis, that green plants use to convert sunlight and water into energy.

How does mobile ownership vary across the world? The latest data from the International Telecommunications Union (ITU) breaks down the number of people for every SIM card subscription across the different continents. Which continents are the mobile rich and which the mobile poor? The results might surprise you. Take a look at the infographic.