Cerebrospinal fluid or Hydrocephalus
"Fluid intelligence involves being able to think and reason abstractly and solve problems. This ability is considered independent of learning, experience, and education. Examples of the use of fluid intelligence include solving puzzles and coming up with problem-solving strategies."
- Verywell Mind
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<span>The number in front is the number of molecules (or atoms) taking part in the (balanced) chemical reaction equation.</span>