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Forget expensive educational DVDs and private tutors, the secret to smart children could be so simple as giving birth to them two year a apart.(1)____ Researchers who studied thousands of children found two-year gap to be optimum in boosting brain power.(2)____ Any shorter and the reading and maths skills of the older child dipped, The effect was strongest between the first and second-born, but siblings in bigger families are also benefited.(3)____
The theory comes from Kasey Buckles, an economist whose own children are, rather unfortunately. Just over two year a apart in age.(4)____ She said it is likely that the difference in academic achievement is liked to the time and resources parents can invest in a child before a young sibling arrives.(5)____
However, waiting for more than two years did not increase the advantage, the Journal，Human Resources will report.(6)____ Siblings with a two-year spaeing include Albert Einstein and sister Maja, and, Lord Attenborough and younger brother David Kasey Buckles, who lead the study told the Sunday Times:”We believe this is the first time anyone has established a casual benefit to increase the spacing between siblings."(7)____ The study also showed that gaps between children in larger families was also beneficial. Buckles told the newspaper.(8)____ "The two year gap is significant because the early years are the most important in a child's development 80 dividing your time when the child is one is more harmful than dividing it when the child is already at school.” The effect more pronounced in families with lower incomes, as those with less money could spend to compromise for lack of time.(9)____(10)____
