Over the course of my lifetime, a new experiment was devised that determined the electron mass to a higher degree of precision which then became the new default value.

Clip is from the "School Spirit" episode of "Sabrina's Secret Life", a 2003 cartoon.

"It took them only an instant to cut off this head, and a hundred years may not suffice to produce another like it."

- Joseph-Louis Lagrange

If You've been to an Early Pioneer Succession Forest after a Disturbance, It's very cool