Abstract
The current status of axion physics is presented. There still exists the axion window 10^9 GeV < F_a < 10^{12} GeV. The recent CAST solar axion search experiment on the axion-photon-photon coupling strength has to be improved by a factor of 100 to reach down to the region of superstring axions. The calculable theta and m_u=0 cases for strong CP solutions, and axino cosmology in SUSY extension of axion are also commented.
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