The Rebbe's Knowledge of Science

Professor Yirmiyahu Branover, of the University of the Negev, relates:

He once presented the plans for a new invention to the Rebbe. He presented the value of the "two-phase flow velocity", and the value of the "efficiency of the system".

The Rebbe immediately responded, that those two values were inconsistent.
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Professor Branover took the plans back to Beer Sheva, where his team reviewed their calculations, but found no error.
The problem was, that the comper program had many thousands of lines of data.

Eight months later they found their error; discovered by a new doctoral student, who had joined their team.