  We initiate a quantitative exploration of the entire landscape. Predictions
thus far have focused on subsets of landscape vacua that share most properties
with our own. Using the entropic principle (the assumption that entropy
production traces the formation of complex structures such as observers), we
derive six predictions that apply to the whole landscape. Typical observers
find themselves in a flat universe, at the onset of vacuum domination,
surrounded by a recently produced bath of relativistic quanta. These quanta are
neither very dilute nor condensed, and thus appear as a roughly thermal
background. Their characteristic wavelength is of order the inverse fourth root
of the vacuum energy. These predictions hold for completely arbitrary
observers, in arbitrary vacua with potentially exotic particle physics and
cosmology. They agree with observation: We live in a flat universe at the onset
of vacuum domination, whose dominant entropy production process (the glow of
galactic dust) has recently produced a radiation bath (the cosmic infrared
background). This radiation is marginally dilute, relativistic, and has a
wavelength of order 100 microns, as predicted.
