you mean the asbestos and all the 'trade secret' ingredients we have no right of studying or understanding in every day items we come into contact with/touch/eat and possibly breath in, which happened to be inside of the towers at the time because several thousand people worked there???
mystery dust... are these people fucking serious?
i'm sure EVERY company had a detailed inventory of every computer, desk, chair, coffee maker, refrigerator, you name it... if it wasn't 'office supplies' like paper clips and highlighters (which i may add sometimes contain over a dozen 'trade secret' ingredients a piece), they know EXACTLY what that 'mystery dust' was.....
pathetic.