How ultracapacitors work (and why they fall short)

Hang around the energy storage crowd long enough, and you’ll hear chatter about ultracapacitors. Tesla Motors CEO Elon Musk has said he believes capacitors will even “supercede” batteries. What is it that makes ultracapacitors such a promising technology? And where do they fall short?

Apple Making Things Right for Unibody MacBook Owners

Apple issued a new support document over the weekend that promises a fix for white, unibody MacBook affected by a problem with peeling rubber on the bottom case. Affected units are now eligible for free repairs, for up to two years from the original purchase date.

Apple Admits MacBook Hard Drives Defective, Offers Free Repair Program

In a move reminiscent of the warranty extension Apple (s aapl) offered to MacBook Pro owners affected by NVIDIA-gate, the Mac maker announced this week that it would offer a similar consideration to some MacBook owners whose hard drives are crashing. Eligible models (black and white MacBooks sold between May 2006 and December 2007) affected by the problem will be repaired at no cost.

On the support page created to describe the problem and the resulting warranty extension, Apple doesn’t mention which brand of hard drives are affected by name, which could mean that the problem doesn’t lie with the hard drives themselves, but with some other system components. Another indication that this is indeed the case is that all capacities of hard drive are also affected. Read More about Apple Admits MacBook Hard Drives Defective, Offers Free Repair Program