  It is suggested that for a fermi gas at unitarity, the two-body bond plays a
special role. We propose an equation of state using an ansatz relating the
interaction part of the $l$-body cluster to its two-body counterpart. This
allows a parameter-free comparison with the recently measured equation of state
by the ENS group. The agreement between the two over a range of fugacity ($z<5$
for a homogeneous gas, and $z<10$ for the trapped gas) leads us to perform the
calculations of more sensitive quantities measured recently by the MIT group.
