HANOVER TWP., Pa. – For some, it's hard to believe, but it's been 25 years to the day since a violent chemical explosion reverberated through the Lehigh Valley and parts of the Poconos.

Let’s start from the beginning – What is an SDR? Is it money? Special Drawing Rights (SDRs) are an asset, though not money in the classic sense because they can’t be used to buy things. The value of ...