  We present the first ever AdS/CFT calculation of $\hat{q}$ for a light quark
jet as a function of position or, equivalently, time. Our result does not
suffer from the gamma factor blow up of the usual time-independent AdS/CFT
heavy quark setup and is qualitatively similar to, but differs by
$\sim\mathcal{O}(1)$ factor from, the light flavor result of Liu, Rajagopal,
and Wiedemann. Our findings can be immediately implemented into any
$\hat{q}$-based energy loss model.
  Our $\hat{q}$ derivation relies on our calculation of the average distance
squared, $s^2(t)$, travelled by the endpoint of a string falling in an
AdS$_3$-Schwarzschild spacetime. The early time behavior is ballistic,
$s^2(t)\sim t^2$, but the late time behavior is the usual diffusive Brownian
motion, $s^2(t)\sim t$. These late time dynamics are universal and depend only
on the near-horizon physics, which allows us to generalize our results to
arbitrary dimensions and thus make contact with the physics explored by RHIC
and LHC.
  Additionally, we find that AdS/CFT predicts angular ordering for radiation in
medium, just as in vacuum, and in contradistinction to weak-coupling, with its
anti-angular ordering prediction. Finally, our results also imply, sensibly,
that AdS/CFT predicts a smooth interpolation between the angular correlations
of open heavy flavor and light flavor observables.
