ORIGINAL AIRDATE: February 5th, 1990 ---
Loggers clash with environmentalists in a town slowly being taken over by the Yakuza.
MISSION: MacGyver visits an old friend only to find her quarreling with local loggers, one of which is her ex-husband. A trail of clues indicates some wrong-doing on the part of the loggers and MacGyver is running out of time to solve the case.
This week's highlights include:

Planck length (Physics)

In physics, the Planck length, denoted ℓP, is a unit of length, equal to 1.616199(97)×10−35 metres. It is a base unit in the system of Planck units, developed by physicist Max Planck. The Planck length can be defined from three fundamental physical constants: the speed of light in a vacuum, the Planck constant, and the gravitational constant.

Check out the article on wikipedia: https://en.wikipedia.org/wiki/Planck_length.

Watch S5E14: "Log Jam" on CBS's website or check the alternative streamability of this episode here.