The science is, of course, not perfect -- for example, they give an explanation why everyone walks around (rather than floats), but that doesn't cover why their hair & other things aren't always floating
Is it just me, or is the whole 'alien artifact' story advancing way too rapidly? It seems like it's featured in the A- or B-plot in every episode so far, and I worry that the writers won't be able to maintain the suspense for the whole season, much less the whole prospective series.
It's a coproduction of one of BBC, and has deals to air in Canada and Germany; I suppose if it does well there, it might get a second season even if ABC doesn't go with it. No idea how likely that would be, though.

(Dungeons & Dragons)
Rulebook featuring "high magic" options, including a host of new spells.