Monthly Archives: December 2011

Artificial hips glide on graphite

22 December 2011
Metal-on metal hip replacements are lubricated by a layer of graphite, say scientists in the US. And this graphitic layer may be the product of proteins ground up the implant itself. This knowledge could help the design of new implants but also raises important questions about the action of the graphite in the body.

Over 50,000 hip replacements are performed each year in the UK and in the US that number is over 200,000. But although surgeons are moving towards low wearing metal-on-metal joints, no one is precisely sure why the two metal pieces slide so well. Although it is known there is a layer that affects the friction, lubrication and wear of the two surfaces, known as a tribological layer, until now no-one has examined its composition.

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Tesla Comes Through With Sub-$50,000 Model S, Mostly

Hannah Elliott, Forbes Staff

The Tesla Model S

Tesla today announced official pricing for its four-door electric sedan: $49,900 for a base Model S after a $7,500 federal tax credit.

The announcement comes after months of Tesla founder Elon Musk promising to deliver his first four-door electric car for around $50,000. (Tesla started selling its battery-powered $109,000 Roadsters in 2008.)

Of course, higher performing versions of the seven-passenger sedan will cost more: $59,900 for a 60 kWh (230-mile-range) model and $69,900 for an 85 kWh (300-mile-range) model. The 85 kWh performance Model S, which comes with additional equipment like Nappa leather interior and performance wheels, will cost $79,900 after federal tax rebates. Musk says it will go 0-60mph in 4.4 seconds.  More…….

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