Weak Signal's description 
Several innovative ideas published over the years point to potential alternatives to conventional space propulsion and may revolutionise space travel (e.g. by using much less energy). A well-known (but hard to realise) concept (inspired partly by Science Fiction) is the "Space Elevator", which may become feasible thanks to carbon-nanotubes cables. As a potentially more practical alternative, a recent scientific paper proposed a giant inflatable tower that could carry people to the edge of space without the need for a rocket, and could be completed much sooner than a cable-based space elevator. What makes this Weak Signal interesting? It reveals technological and/or scientific anomalies; It reveals economic anomalies