Try as I may, I keep forgetting the kanji for 遺伝子 (いでんし: “gene, genetics”)…

On the other hand I have absolutely no trouble remembering words like 居合い (いあい: “act of drawing one’s katana, killing with a single stroke, shaking out the blood and sheathing the katana back, as one single movement” — yes, it means all that; no, I am not kidding) after seeing them used exactly once.

Which would be great if, you know, there was more assisting with friends’ seppuku and less messing around with genes, in my life right now.