Assertion: central nervous system's brain | /r/CapableOf | weigh 3 pounds
Facets:
value: by the time
type: TEMPORAL
Source sentences:
text: The average brain weighs 3 pounds (1.3 kg) and contains 100 billion nerve cells, or neurons.
text: By the time an average person reaches adulthood, the brain weighs about 3 pounds (1.36 kilograms).
text: The human brain (which weighs only about 3 pounds, or 1,300 grams) is estimated to contain over one hundred billion neurons.