  It is commonly believed that the lowest-lying scalar glueball lies somewhere
in the isosinglet scalar mesons $f_0(1370), f_0(1500)$ and $f_0(1710)$ denoted
generically by $f_{0}$. In this work we consider lattice calculations and
experimental data to infer the glue and $q\bar q$ components of $f_0$. These
include the calculations of the scalar glueball masses in quenched and
unquenched lattice QCD, measurements of the radiative decays $J/\psi\to\gamma
f_{0}$, the ratio of $f_{0}$ decays to $\pi\pi$ and $K\bar K$, the ratio of
$J/\psi$ decays to $f_0(1710)\omega$ and $f_0(1710)\phi$, the $f_0$
contributions to $B_s\to J/\psi\pi^+\pi^-$, and the near mass degeneracy of
$a_0(1450)$ and $K_0^*(1430)$. All analyses suggest the prominent glueball
nature of $f_0(1710)$ and the flavor octet structure of $f_0(1500)$.
