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A day ahead of CEO Tim Cook's planned appearance in front of the US Senate, Apple has published its official testimony (PDF) for the Senate Permanent Subcommittee on Investigations. An 18-year-old student, Eesha Khare, has reportedly developed a new form of energy storage, referred to as a supercapacitor, that promises to recharge a cellphone in 20 to 30 seconds. Images reported to be of the rumored Samsung Galaxy S4 Active have surfaced, complete with a ruggedized casing. Sony has teased its upcoming game console, via a video uploaded to YouTube. The clip, which alternates between close-up shots and one zooming into what could be presumed to be the impending PlayStation 4, is released the day before Microsoft is due to reveal its future plans for its own replacement for the Xbox 360. The Prime Minister of Turkey, Recep Tayyip Erdoğan, has been touring Silicon Valley companies this week, on the heels of a similar tour by Turkish President Abdullah Gül last month. Yahoo has confirmed it has bought Tumblr, in a deal noted yesterday to be in the region of $1.1 billion. A report in the Taiwanese trade paper DigiTimes -- which has a mixed track record of accuracy -- claims that Apple will begin large-scale production of the fifth-generation iPad in July, with a possible launch in September. The Acer Iconia W3 has been leaked yet again, but this time through Acer itself, and confirming it as having an 8. A future update for the Samsung Galaxy S III could include a number of features carried over from the Galaxy S4, according to a report. Sony has announced the belated global availability of its Xperia Tablet Z. First unveiled in January, and finally made available for pre-order in the US in late April, international customers can now also place pre-orders for the device.