Energy independence" and its rhetorical (修辭的) companion "energy security" are, however, slippery concepts that are rarely though through.

And while he has been doing this, he has been learning other things as well, including many of the concepts that the schools think only they can teach him, and many that are more complicated than the ones they do try to teach him.

Ideas about learning by doing have struggled to become mainstream educationally, despite being old concepts from Dewey and Montessori, Plato and Aristotle, and in the American context, Ralph Emerson, on the value of experience and self-reliance.

Mike Ellicock,chief executive of National Numeracy said we want to challenge this "I can't do maths" attitude that is prevalent in the UK, adding that it was vital that all primary school teachers understand key maths concepts as young children who fail t

But all these concepts are massively expensive, require safety certification standards for road and air, need dual controls, involve complex folding wings and propellers,and have to be flown from air-strips.

Maria Droujkova is a founder of Natural Math, and has taught basic calculus concepts to 5-year-olds.

similar studies tested whether students learned basic physics and chemistry concepts better by reading plain text or viewing pictures to and everyone do better with the help of pictures.