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Bruce Schneier was invited to testify about the TSA to the House Committee on Oversight and Government Reform, but at the last minute he was disinvited, after the TSA objected to having him in the room.

Water towers have been a common sight in cities, towns and villages all across the world since at least the Industrial Revolution. As certain towers fall out of use for one reason or another, they are often left standing thanks to their historical significance. But why leave these fascinating structures empty and languishing? These majestic homes were all once functional water towers but have since been converted into the type of home most of us can only dream about.

"Salman Khan's dream college looks very different from the typical four-year institution. The founder of Khan Academy, a popular site that offers free online video lectures about a variety of subjects, lays out his thoughts on the future of education in his book, The One World School House: Education Reimagined, released last month. Though most of the work describes Mr. Khan's experiences with Khan Academy and his suggestions for changing elementary- and secondary-school systems, he does devote a few chapters to higher education."

"In the Harry Potter world, Ravenclaws are known for being the smart ones. That's their thing. In fact, that was really all they were known for. In the books, each house could be boiled down to one or two words: Gryffindors are brave, Ravenclaws are smart, Slytherins are evil and/or racist, and Hufflepuffs are pathetic loyal. (Giving rise to this hilarious Second City mockery.)"

The Economist is hosting a debate between Bruce Schneier and former TSA honcho Kip Hawley, on the proposition "This house believes that changes made to airport security since 9/11 have done more harm than good." I'm admittedly biased for Bruce's position (he's for the proposition), but it seems to me that no matter what your bias, Schneier totally crushed Hawley in the opening volley. The first commenter on the debate called Hawley's argument "post hoc reasoning at its most egregious," which sums it all up neatly.

"Wikipedia founder Jimmy Wales has spoken out against the Draft Communications Bill, the UK government plans to monitor and store all digital communications, dubbed the "Snooper's Charter". In case Draft Communications Data Bill becomes the law, the US entrepreneur has promised to encrypt all connections between Wikipedia servers and the UK, effectively reducing the government's ability to snoop on use of Wikipedia. Wales was speaking to a  joint committee tasked with scrutinising the proposed Communications Bill before it is debated in the House of Commons."

Joey Hudy, a young "maker" from Phoenix went to the White House this week to show off his project, the "Extreme Marshmallow Cannon." When President Obama saw it, he told Joey: "Let's try it." Joey set up the air cannon, which uses a bicycle pump to build up air pressure, and put a marshmallow down the barrel. When he pressed the trigger, a single marshmallow was shot out across the room to the delight of everyone, but especially the president.

Two years ago this week, ThinkUp was born. Our first year we moved from alpha into beta, and our second year we graduated out of beta to great response. Today I'm thrilled to report that over 15,000 social media accounts are registered on over 5,000 ThinkUp installations around the web. ThinkUp's most well-known users include the White House, Martha Stewart, Steve Martin, Disney, and Pixar. Our birthday is as good a time as any to do an honest assessment of where the ThinkUp product, community, and code currently stands. Here's where we are.

Six U.S. government agencies will spend more than $200 million to help the government better organize and analyze large volumes of digital data, in a new "big data" research and development effort announced by President Barack Obama's administration Thursday.