Hosts Phil Bowermaster and Stephen Gordon  return to one of their favorite topics -- The Adjacent Possible -- "a kind of shadow future, hovering on the edges of the present state of things, a map of all the ways in which the present can reinvent itself." 

How do the plans of Thoth, a Canadian aerospace firm, to construct a 20-KM-high inflatable space elevator demonstrate the adjacent possible? Such a tower would have obvious implications for space travel, but what about energy, terrestrial travel, communications, recreation, sports, etc.? The possibilities are vast once you begin exploring them.

Plus: a Modafinil update.

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