NSA slides explain the PRISM data-collection program  —  The top-secret PRISM program allows the U.S. intelligence community to gain access from nine Internet companies to a wide range of digital information, including e-mails and stored data, on foreign targets operating outside the United States.

Startup Investing Trends  —  Y Combinator has now funded 564 startups including the current batch, which has 53.  The total valuation of the 287 that have valuations (either by raising an equity round, getting acquired, or dying) is about $11.7 billion, and the 511 prior to the current batch have collectively raised about $1.7 billion.

Apple Seeks to Trademark ‘IWatch’ in Japan for Devices  —  Apple Inc. (AAPL), the world's most valuable technology company, is seeking a trademark for “iWatch” in Japan as rival Samsung Electronics Co. readies its own wearable smartphone device.  —  The maker of iPhones is seeking protection …

Confirmed: Nokia takes full control of Nokia Siemens Networks after buying out Siemens for $2.2B  —  Nokia has announced that it has taken full control of its telecoms equipment joint-venture Nokia Siemens Network, after it agreed to buy out partner Siemens in a €1.7 billion ($2.2 billion) deal.

Microsoft launches web-based Xbox Music, available for subscribers now  —  We expected Microsoft to launch its Xbox Music web version this week, and it appears the site is online and ready to use.  Xbox Music Pass subscribers can access the web player from music.xbox.com, with a responsive design that adapts to your browser size.

UK's BSkyB Wins Case Against Microsoft Over Use Of “SkyDrive” Name In Europe; May Have To Drop Name Or Pay Fines  —  Microsoft went big on pushing cloud services this week at its Build conference, but today it was dealt a blow for how it might get to market them in Europe.

Google's Quantum Computer Proven To Be Real Thing (Almost)  —  Google bought one.  So did Lockheed Martin, one of the world's largest defense contractors.  But we still can't agree on what it is they bought.  —  D-Wave, the company that built the thing, calls it the world's first quantum computer …

Foundation: Evan Williams on Hatching Big Ideas  —  In today's episode of my Foundation series, serial entrepreneur Evan Williams talks candidly about his experiences building Blogger, Twitter, and his latest project, Medium.  Ev recounts the early days of Twitter, shares what he's learned …