*"The beauty of nature lies in her simplicity."*

Left ventricular diastolic time constant, Tau is the most established index to describe diastolic function. A Harvard method of Tau was invented by Dr JD Thomas has been dominant non-invasive Tau measurement for more than two decades. Now, Tau is dead clinically. Only when the logically flawed celebrity method is objectively reassessed and discarded, can Tau be given a chance. A new method is dawning and promising…

1976, Tau was born in John Hopkins.

1992, the first non-invasive try, Harvard.

1992, the first formula, with four assumptions, Harvard.

1993, another non-invasive try with decent data, Mayo Clinic.

1995, a similar strategy applied to AI patients, Japan.

1995, I published a MR based formula with one assumption.

1997, the Harvard formula was validated in Cleveland.

2005, Langer presented a non-zero asymptote model.

2008, I improved my MR based formulas, without assumption.

2008, I did a similar deduction for AI based Tau.

2008, Chen developed program for my formulas, free download.

2008, my poster in ASE 19th Annual Scientific Sessions.

2009, my poster in CSE forum.

2009, DF guideline (ASE) recommended Harvard formula.

2009, I gave my opinion about the guideline recommendation.

2009, "Response to Bai" from guideline writing group. It motivated me to create this Blog.

2010, Dr Wang and me presented general Tau.

2008, Chen developed program for my formulas, free download.

2008, my poster in ASE 19th Annual Scientific Sessions.

2009, my poster in CSE forum.

2009, DF guideline (ASE) recommended Harvard formula.

2009, I gave my opinion about the guideline recommendation.

2009, "Response to Bai" from guideline writing group. It motivated me to create this Blog.

2010, Dr Wang and me presented general Tau.

2011-11-29, I gave a talk in National Capital Echo Round (Ottawa)

2016-03-29, I gave a talk at the Heart Institute, the North Hospital (Shenyang, China)

2016-04-01, I gave a talk at the Cardiac Function Dept., the 1st Clinical College, Chinese University of Medicine. (Shenyang, China)

2016, Symmetry inspired by the approach of Tau.

2017, Calculation of LAP (based on my formulas) got a Chinese Natural Science Founding.

2020-1-1, response to "response to Bai"

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