Dartmouth College employs computer learning techniques in a very broad array of courses. For example, a student can gain a deep insight into the statistics of Mendelian genetics in an hour with the computer rather than spend a year crossing fruit fliesin the laboratory.

Meaning: Your own mistakes can teach caution, but another person’s experience may offer the same lesson without the same cost. Listen for relevant lessons before repeating an avoidable error.

Meaning: Completing a worthwhile action after a delay is often better than abandoning it altogether. Missing the ideal moment does not always remove the value of doing it now.

Meaning: People or matters that are absent for a long time may lose their place in everyday attention. The saying describes a risk of being overlooked, without proving that distance ends affection or that a forgotten person has less worth.

Meaning: Advice offered after an irreversible action cannot prevent what has already happened. Give relevant guidance while someone can still use it, and distinguish prevention from help with what comes next.