More props at the Worldcon, replica Time Machine from "Back to the Future." Remember Doc Brown imploring Marty to think four-dimensionally? Processes that are irreversible in time are called Arrows of Time. We already can answer the Cosmological Arrow with R = ct. Expansion of the Universe is indistinguishable from the forward flow of Time.
If we drop a cup and it shatters, the pieces will not re-assemble themselves. Entropy of the Universe always increases. This Thermodynamic Arrow is related to Planck value h. Since most measurements indicate that the product hc is constant, as c slows h increases. Uncertainties related to h increase with Time. This small link between Relativity and Quantum Mechanics explains the Thermodynamic Arrow.
Steinn Sigurdsson has the latest dish on a Dark Energy Mission. We can wish them luck as they compete for funding with other projects. Queenslanders, a memorial for Steve Irwin will be held at his Australia Zoo on Wednesday.
I am not the sort who can ask for billion-dollar spacecraft to seek a dark energy equation of state. The Earth offers answers of her own. Evidence for a Theory involves the Hubble Space Telescope, our Subaru Telescope atop Mauna Kea, observations of the Sun, and even coral reefs. The Earth has made records of the speed of light, we need only look at them.