Occasionally, in the world, we observe empirical laws – the laws of experiment - that seem to be spookily accurate. There’s no theoretical reason why they should be obeyed, but they just happen to describe the world remarkably well. Perhaps the best example of this, that has changed and will change the world the most, is Moore’s Law. But there's another example - one that will render every Green warrior happy to think about. The price of solar energy is dropping off a cliff. Tweet us @physicspod Listener Questions sought for Upcoming Listener Question Episode Read old scripts on Medium Like and review on iTunes for your chances at a PRIZE DRAW Tell one friend and in thirty episodes we'll have a trillion listeners. Regular apocalyptic service will be resumed next Saturday.