We're still waiting for some more news about its promised mobile apps, but T-Mobile's new Bobsled sub-brand has now cleared one big hurdle that was thrust in front of it. The company's initial offering, a VoIP service for Facebook, has returned to the social network a full month after it was "voluntarily and temporarily" pulled during its first week of operation. In case you missed it, the Facebook component is simply a basic VoIP service that lets you make free voice calls to any of your Facebook friends, and it now boasts a redesigned interface that promises to "more clearly differentiate it from a Facebook owned service."
As you may know, crafting a katana is a delicate process that involves carefully constructing a razor-sharp high-carbon edge around a soft shock-absorbent core. One day though, smiths and forging fires could be replaced by electrode-wielding mad-scientists, with the technology to selectively harden and soften metal at will. At least that's what we envisioned when we read about Jörg Weißmüller's breakthrough research in the field of nanomaterials. The German scientist discovered that by placing precious metals in acid he could create tiny ducts through corrosion. Once those channels are flooded with a conductive liquid, electrical currents can be used to harden the material and, if you change your mind about the brittle results, the effect can easily be reversed to make it soft again. The tech could eventually lead to self-healing vehicle armor or scratch-resistant cellphones -- but, really, we just want to zap our way to a high-quality samurai sword. Physorg
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