szczys writes: You'd think Tide prediction would be quite easy, it comes in, it goes out. But of course it's driven by gravity between the moon and earth and there's a lot more to it. Today, computer models make this easy, but before computers we used incredible analog machines to predict the tides. The best of these machines were the deciding factor in setting a date for the Allies landing in Europe leading to the end of the second world war. From the Hackaday story: "In England, tide prediction was handled by Arthur Thomas Doodson from the Liverpool Tidal Institute. It was Doodson who made the tidal predictions for the Allied invasion at Normandy. Doodson needed access to local tide data, but the British only had information for the nearby ports. Factors like the shallow water effect and local weather impact on tidal behavior made it impossible to interpolate for the landing sites based on the port data. The shallow water effect could really throw off the schedule for demolishing the obstacles if the tide rose too quickly. Secret British reconnaissance teams covertly collected shallow water data at the enemy beaches and sent it to Doodson for analysis. To further complicate things, the operatives couldn’t just tell Doodson that the invasion was planned for the beaches of Normandy. So he had to figure it out from the harmonic constants sent to him by William Ian Farquharson, superintendent of tides at the Hydrographic Office of the Royal Navy. He did so using the third iteration of Kelvin’s predictor along with another machine. These were kept in separate rooms lest they be taken out by the same bomb.

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HughPickens.com writes: Nick Wingfield has an interesting article in the NYT about how Seattle, Austin, Boulder, Portland, and other tech hubs around the country are seeking not to emulate San Francisco where wealth has created a widely envied economy, but housing costs have skyrocketed, and the region's economic divisions have deepened with rent for a one-bedroom apartment in San Francisco at more than $3,500 a month, the highest in the country. "Seattle has wanted to be San Francisco for so long," says Knute Berger. "Now it's figuring out maybe that it isn't what we want to be." The core of the debate is over affordable housing and the worry that San Francisco is losing artists, teachers and its once-vibrant counterculture. "It's not that we don't want to be a thriving tech center — we do," says Alan Durning. "It's that the San Francisco and Silicon Valley communities have gotten themselves into a trap where preservationists and local politics have basically guaranteed buying a house will cost at least $1 million. Already in Seattle, it costs half-a-million, so we're well on our way." Seattle mayor Ed Murray says he wants to keep the working-class roots of Seattle, a city with a major port, fishing fleet and even a steel mill. After taking office last year, Murray made the minimum-wage increase a priority, reassured representatives of the city's manufacturing and maritime industries that Seattle needed them., and has set a goal of creating 50,000 homes — 40 percent of them affordable for low-income residents — over the next decade. "We can hopefully create enough affordable housing so we don't find ourselves as skewed by who lives in the city as San Francisco is," says Murray. "We're at a crossroads," says Roger Valdez. "One path leads to San Francisco, where you have an incredibly regulated and stagnant housing economy that can't keep up with demand. The other path is something different, the Seattle way."

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Unicode Normalization Forms

Common wrapper functions for use with either Net::FTP, Net::SFTP, Net::FSP, Net::FTPSSL, Net::OpenSSH, Net:SSH2, and Net::SFTP::Foreign.

Perl interface to libpuzzle.

Perl class for reading/writing DCMTK dcmqrscp configuration file.

Makes your tests always pass under CI

A number of medals awarded to Antarctic explorer Sir Ernest Shackleton raise £585,000 at a London auction.