Tarantula...

...but perhaps not what you were expecting.  This is the Tarantula Nebula, via APOD (of course!).

The Little Book of Semaphores...

A freely downloadable book about concurrent programming.  I've only skimmed it so far, but it looks pretty good...

Ice Extrusions...

Both by happenstance and by design, ice can be extruded from large containers with small exits (as in the photo at right).  James Carter has learned how to do this on purpose.  See his web site for lots of interesting examples and an explanation...

Online Advanced JavaScript Course...

Here.

WTF: IPv6 in the Science journals?

Here's an example.

An entire generation of computer scientists has been born, educated, and gone to work since IPv6 was first invented.  There are very damned few deployments of it outside of the backbone.  The benefits are clear, but so are the implementation challenges.

The linked article refers to a government mandate for IPv6 upgrading.  I'd get excited about that except that I remember the first such mandate (around 1995), the second (around 2000), and the third (around 2005) – none of which had much impact so far as I can tell.  Outside of the squandering of vast amounts of taxpayer dollars, of course.

Sheesh.