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Today's Tech: Miniscule carbon nanotubes to conquer silicon chips and billionaire Fairfax owner pushes $4.7bn BlackBerry bid

Prem Watsa, the billionaire chief executive of Fairfax Financial, has said he believes the consortium he is leading to purchase BlackBerry for $4.7 billion (£2.9 billion) will be successful. He defended the price offered and asserted that the consortium can raise the funds despite the figure not yet being reached. "We wouldn't put our name to such a high-profile deal if we didn't feel confident that at the end of the day that our due diligence would be fine and we'd be able to finance it," Watsa said. Amidst fear that the deal could collapse, BlackBerry shares on Wednesday closed at $8.05 (£5), almost a dollar down on on the offer submitted by Watsa on Monday.

Apple's new iPhone 5S costs $199 (£124) to manufacture, about $2 more than the previous-generation iPhone 5, according to IHS iSuppli. The 16GB iPhone 5S carries a bill of materials of $191, while an $8 manufacturing cost brings it to $199, the group found in its teardown of Apple's new smartphone. The 32GB model lands at $208 (£129), while the 64GB is $218 (£135). The most expensive part of the gadget remains the display and its touch-screen subsystem, at $41. That hasn't changed from the iPhone 5, with Japan Display Inc., LG Display, and Sharp producing them. The iPhone 5S is retailing SIM-free at £549 for the 16GB model, £629 for the 32GB variant and £709 for the 64GB iteration.

In recent years, people have turned to Twitter for quick information about emergency situations. In the immediate aftermath, however, it's tough to know what's true and who to trust. Twitter is moving to change that with Twitter Alerts, which will provide users with notifications about emergency situations from trusted sources. "Twitter Alerts ... brings us one step closer to helping users get important and accurate information during emergencies, natural disasters or when other communications services aren't accessible," Twitter said in a blog post. Twitter has partnered with dozens of organisations, including the American Red Cross, FEMA, the World Health Organization, and various state and local groups.

Future computers could run on lab-grown circuits that are thousands of times thinner than a human hair and operate on a fraction of the energy required to power today's silicon-based computer chips, extending Moore's Law for years to come. Stanford University researchers this week reported that they have built a working computer using transistors fashioned from carbon nanotubes (CNTs), a possible breakthrough in finding a cooler alternative to the heat-generating, silicon-based circuitry used in computing today. The team, led by Stanford professors Subhasish Mitra and H.S. Philip Wong, managed to overcome a "bedeviling" host of problems with CNTs, which "has long frustrated efforts to build complex circuits using CNTs," a Stanford media relations spokesperson said his week. For more information on the breakthrough, follow the link above.