熟知

熟 = 享 + 丸 + 灬 : Sheldon Shrimp (shu) concocts an elixir against his stomach ache in the space station's kitchen (Ø2). On a small grill (灬) He put a drink (享) in which he dissolves a whole bag of painkillers (丸). When the pills are fully dissolved, his elixir is done (熟).

熟 = 孰 + 灬 : The riddler captured Sheldon Shrimp (shu) in the space station's kitchen (Ø2) and threatens to put him on a grill (灬) and cook him until he is ripe (熟) if he fails to win a game of "who am I" (孰).

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).