Thursday's run (17km) started in darkness to give me the sun sneaking between Mid-Canterbury's horizon and stratocumulus clouds before it disappeared above the grey at 7 a.m. My podcast ( "Things You Should Know" ), which I sometimes listen to when running, tells me that each photon of light that hits us has been bouncing around inside the sun for half a million years before it warms our skin. Somehow I do not feel quite so old!