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2. Three mountain problem - Wikipedia

   en.wikipedia.org/wiki/Three_mountain_problem

   The children were asked to hide another doll, a “boy” doll, away from both policemen's views. The results showed that among the sample of children ranging from ages 3.5-5, 90% gave correct answers. When the stakes were raised and additional walls and policeman dolls were added, 90% of four-year-olds were still able to pass the task. [7]

3. Stanford marshmallow experiment - Wikipedia

   en.wikipedia.org/wiki/Stanford_marshmallow...

   The participants consisted of 50 children (25 boys and 25 girls) from the Bing Nursery School at Stanford University. They ranged in age from 3 years 6 months to 5 years 6 months. The median age was 4 years 6 months. Six subjects were eliminated because they failed to comprehend the instructions given by the experimenters.

4. Make believe - Wikipedia

   en.wikipedia.org/wiki/Make_believe

   In 3 year olds, this cognitive ability is evident in pretend play but not in other activities. [2] For example, the child can pretend that a pen is a toothbrush, but when shown an apple-shaped soap bar, the child is unable to comprehend the real and apparent features of the object.

5. Dual representation (psychology) - Wikipedia

   en.wikipedia.org/wiki/Dual_representation...

   Many variations on the original task retrieval experiment have been conducted using three-year-old and two-and-a-half-year-old children, yielding very different results between the two groups. Though only six months apart, three-year-olds consistently perform very well whereas two-and-a-half-year-olds perform very poorly, with a retrieval ...

6. Gilbert U-238 Atomic Energy Laboratory - Wikipedia

   en.wikipedia.org/wiki/Gilbert_U-238_Atomic...

   Gilbert cloud chamber, assembled An alternative view of kit contents. The lab contained a cloud chamber allowing the viewer to watch alpha particles traveling at 12,000 miles per second (19,000,000 m/s), a spinthariscope showing the results of radioactive disintegration on a fluorescent screen, and an electroscope measuring the radioactivity of different substances in the set.

7. Toddler - Wikipedia

   en.wikipedia.org/wiki/Toddler

   A toddler is a child approximately 1 to 3 years old, though definitions vary. [1] [2] [3] The toddler years are a time of great cognitive, emotional and social development. The word is derived from "to toddle", which means to walk unsteadily, like a child of this age. [4]