Revert "Delete 2017-01-09-about_talk.md"
Revert "Delete 2017-01-09-about_talk.md"

This reverts commit 5692edc2a965539042ed5d8d91e627ddf38ac7ea.

StephenChan007/StephenChan007.github.io,StephenChan007/StephenChan007.github.io