Institute for Advanced Study Astrophysics Special Astrophysics Seminar - ABSTRACT UPDATED

I discuss ongoing efforts to make vast 3D maps of our universe using 21 cm tomography, thereby shedding light on the cosmic dark ages and the epoch of reionization and providing new information about dark matter, dark energy and our cosmic origins. I also comment on the latest developments regarding BICEP2, Planck, Galactic dust and possible and inflationary gravitational waves.