Examlex
How is an X- ray burst (in an X- ray binary system) similar to a nova?
Months of Age
A measurement of age used particularly in the context of very young children, expressing how many months old they are.
Sitting Up
The physical action of moving from a lying or slouching position to an upright posture, often indicating readiness or alertness.
Object Permanence
The understanding that objects continue to exist even when they cannot be observed, a concept developed during infancy.
Peek-a-Boo
A game played with young children involving hiding and suddenly reappearing, aiming to invoke surprise and delight.
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