In the second paper,
he developed a theory of
Brownian 
motion,
confirmed experimentally a
few years later and provided
a convincing evidence of
the atomic picture of matter The third paper gave birth
to the special theory of
relativity In 1916, he
published the general
theory of relativity Some of
Einstein’s most significant
later contributions are: the
notion 
of 
stimulated
emission introduced in an
alternative derivation of
Planck’s 
blackbody
radiation law, static model
of the universe which
started modern cosmology,
quantum statistics of a gas
of massive bosons, and a
critical analysis of the
foundations of quantum
mechanics