Marcus Winters on teachers’ unions versus educational standards. 

The premise underlying the policies favoured by the teachers’ unions, which govern so much of the relationship between public schools and teachers, is that all teachers are uniformly effective. Once we can objectively distinguish between effective and ineffective teachers, the system of uncritically granted tenure, a single salary schedule based on experience and credentials, and school placements based on seniority become untenable. The unions don’t want information about their members’ effectiveness to be available, let alone put to practical use.

TM Lutas on scientific scandals past and present.

So without any conspiracy we seem to be betting trillions on science that does not adequately coordinate to prevent control data from entering real data sets, has practices in the discipline that are inadequate to guard against undue weight, and is taking large chunks of its data from weather stations whose error bars far exceed the global warming signal we’re all supposed to be worried about. At this point a finding of “no conspiracy” would not reassure me. It should not reassure us at all.

Simon Scowl on James Cameron and his Avatar.

James “King of the World” Cameron is lecturing you about your unearned sense of entitlement. Isn’t that cute? […] Why is it okay for James Cameron to devote whole rooms full of energy-sucking computers – and the Red Bull-sucking nerds in front of them – to creating photorealistic cat people, but I get a lecture when I leave my cell phone charger plugged in? […] It’s not enough to be rich and famous if you’re not somehow “relevant.” Whether it’s Prince Charles or Al Gore or Leonardo DiCaprio or any of these other guys, they all have the same message: “Hey, I deserve to live like this. Now shut up and shiver in the dark, you peasants.”

Feel free to share your own items of interest.

Speaking of things festive, here’s the world’s smallest snowman. At just 0.01 mm across, he’s slimmer than a human hair. Strictly speaking, he’s also made of tin.

The eyes and smile were milled using a focused ion beam, and the nose, which is under 1 µm wide (or 0.001 mm), is ion beam deposited platinum.

The object was built by Dr David Cox of the National Physical Laboratory’s Quantum Detection Group. The video below should give you some idea of just how small the snowman is.

Faithful in sentiment, if not materials or size.

I began my work at a time when invisibility was not fashionable at all.

Physicist Ulf Leonhardt, quoted here, in a piece noting how research into cloaking technologies has become popular and very nearly respectable. Needless to say, there are still one or two problems.

It’s difficult to find anybody in the know who expects there will ever be a device that hides itself and its contents at all wavelengths – if you can’t see it in visible light, then perhaps radar, infrared, ultraviolet or X-rays would reveal it. But optimism for practical uses is growing.

And there’s an issue I don’t recall being acknowledged in Star Trek. 

If a cloak were to make an object fully invisible to the outside world, then the outside world would be invisible to the object within the cloak. A thing (or person) inside a perfect cloak is not only invisible. It is blind.

A selection of Martian landscapes.

Just 8 km in diameter, Saturn’s moon Daphnis casts its shadow. The tiny moon’s gravity creates waves in Saturn’s A ring that extend above the plane to a height of 1.5 km. Image taken by Cassini in visible light on June 26, at a distance of approximately 823,000 km from Daphnis.

More, with animations. Related: Planetary Bling.