ZHANG, Ruda November 24, 2019:  Add climate econometrics; more edits. [a8291fb]
ZHANG, Ruda February 24, 2019:  Replace superscript * to ∗ [d60bd7f]
ZHANG, Ruda February 19, 2019:  Reflow text. [b46257b]
ZHANG, Ruda December 30, 2018:  Use dollar style math markup. [1b7036c]
ZHANG, Ruda September 30, 2018:  CSS redesign; more edits. [dd44d96]
ZHANG, Ruda March 23, 2018:  Global remove trailing whitespaces [2b7ff90]
ZHANG, Ruda March 23, 2018:  More on WADGPS, map elements; topology/manifold, math branches, Taleb on probability [46880f6]
ZHANG, Ruda February 14, 2018:  More on mechanism design [d8ff3e9]
ZHANG, Ruda February 13, 2018:  Define private/public goods; more on mechanism design. [00c0a3b]
ZHANG, Ruda February 11, 2018:  Add 2007 Nobel price illustration [1551551]
ZHANG, Ruda February 10, 2018:  Separate mechanism design from game theory main page [341d637]
Ruda Zhang May 31, 2017:  Criteria of good scientific research [a64eaf9]
Ruda Zhang May 31, 2017:  Add history of economics, initiate notes on mechanism design. [90d3c67]