It's the time of year when experts on relationships give advice. Not experts on their own, but rather experts on yours.

All that's needed is a weak observational study based on surveys and it practically writes itself.

Are American jobs less stable? Do workers change employers more frequently than in the past?

The reflexive answer is yes, especially since unemployment is the worst it's been in decades, but on average that is not the case. On average, job tenure (the number of years working for the same employer) has been reasonably stable over time between 1983 and 2008 - though that obviously leaves out the 1970s and the recent prolonged economic troubles. 

You learned in high school that light has a dual nature - it exists as both waves and photons. It is this duality of light that enables the coherent transport of photons in lasers. 

Physicists know that, at the atomic-scale, sound has the same dual nature, existing as both waves and quasi-particles known as phonons. Knowing that, phonon-based lasers have also been in development since the first functioning laser was created in 1960, with limited success.

Nine years ago, Dennis Aabo Sørensen of Denmark lost the use of his left hand handling fireworks during a family holiday. 

Now he has become the first amputee in the world to feel sensory-rich information, in real-time,  with a prosthetic hand wired to nerves in his upper arm.

Silvestro Micera and a team at Ecole Polytechnique Fédérale de Lausanne (EPFL) and SSSA (Italy) developed the sensory feedback that allowed Sørensen to feel while handling objects.

A prototype of the bionic technology was tested in February 2013 during a clinical trial in Rome under the supervision of Paolo Maria Rossini at Gemelli Hospital (Italy). The study represents a collaboration called Lifehand 2 between several European universities and hospitals. 

When it comes to discussion about public schools, the administation's education experts call the educators and students they claim to support 'dismal' on a regular basis.

Stars like Sol are relatively easy to understand, because they are numerous, and live for billions of years, but high mass stars are rare and live for only a few million years. As a result, understanding their early evolution has been a challenge.  

Simple models suggested that when high mass stars become hot enough to ionize the gas around them, heating it to thousands of degrees, the gas will quickly expand. But decades ago, astronomers found that regions of ionized gas around young high mass stars remain small (under a third of a light-year) for ten times longer than they should if they were to expand as predicted.