知
=
口
+
矢
:
Mnemonic symbol: Francis Bacon is attributed to have stated "scientia potentia est", "knowledge is power". I'll thus represent 知 by Francis Bacon. Francis Bacon (知) and James II of England (zh) are playing darts (矢) in front of the space station (Ø1). Because they lack a dart board they just use a mandarin (口).
悉
=
心
+
釆
:
Marie Curie (xi) noticed that her heart (心) is not working very well in front of the space station (Ø1). It is probably just the lack of any atmosphere and freezing temperature; but in all cases (悉) she wants to know (悉) what is going on and takes a few samples with her sampling tool (釆).