At that age I'd be eating the quarters.

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I dont get what these tests should prove. Perhaps that experience concurs to our IQ? =p

Silly scientists -.-

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No Gods but Yourself!! >.<

The important part about playing at an early age is learning about how our physical world behaves. Infants aren't aware of how gravity works and that its always going to pull things down. Kids that are still young don't completely grasp a lot of basic things only because they're still new to this world and its real time physics engine.

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These experiments are showing how kids at different ages develop specific cognative abilities. According to this guy Piaget we all aquire the ability to make certain cognitive leaps at specific times in our development.
Like when we are very young no matter how bright the child is it can't comprehend of how someone else might see the world and sees itself as the centre of everything. It's really interesting stuff.

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To me it's just a matter of volumes and areas: if you lack the concept of volume you'd obviously say the taller glass has more juice, it's linear, independent of "before and after". Same thing for the coins, they're "wider"; saying just "more" and "less" isnt an appropriate terminology to use with persons that lack basic measurement concepts.

Whether kids are able or not to understand these basic concepts, instead, is another kettle of fish.

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No Gods but Yourself!! >.<

yeah, but to answer you're statement "what does it prove" the series of experiments are based on the psychological theories of jean piaget and through the experiments scientists were able to prove various things that now get used in school curriculums and such. In psychology it can be really hard to prove things scientifically, unlike chemistry and physics where you can set up very controlled experimental conditions. Psychological theories about brain development and emotions etc are difficult to create experiments for. But this guy did manage to prove quite alot of his theories by observing children and inventing a series of standardised questions to ask kids of various ages. I think psychology is just so interesting. I just finished a 36 part lecture series on my ipod about everything from Freud to personality disorders to anti-psychotic drugs. even though I'm no scientist I find that understanding what scientists currently know about psychology can be quite empowering in your day to day life. This Piaget stuff would be worth studying in detail if I ever have kids.

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I swear, if my little brother got two crackers that were bigger than mine I would have thrown a fit, unlike the girl in the video. Of course my parents would have taken both crackers from me for acting like a brat.

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LOL!!

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No Gods but Yourself!! >.<