Most commonly observed phenomena with light can be explained by waves. But the photoelectric effect suggested a particle nature for light. Then electrons too were found to exhibit dual natures.
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In 2001, Dickens and Flynn presented a model for resolving several contradictory findings regarding IQ. They argue that the measure " heritability " includes both a direct effect of the genotype on IQ and also indirect effects such that the genotype changes the environment , thereby affecting IQ. That is, those with a greater IQ tend to seek stimulating environments that further increase IQ. These reciprocal effects result in gene environment correlation . The direct effect could initially have been very small, but feedback can create large differences of IQ. In their model, an environmental stimulus can have a very great effect on IQ, even for adults, but this effect also decays over time unless the stimulus continues (the model could be adapted to include possible factors, like nutrition during early childhood, that may cause permanent effects). The Flynn effect can be explained by a generally more stimulating environment for all people. The authors suggest that any program designed to increase IQ may produce long-term IQ gains if that program teaches children how to replicate the types of cognitively demanding experiences that produce IQ gains outside the program. To maximize lifetime IQ, the programs should also motivate them to continue searching for cognitively demanding experiences after they have left the program.  
Here's the latest story by Tina about how romance and love can thrive in a culture where arranged marriages are common. Those who enjoyed her first story will not be disappointed. In this one, what at first looked like a disaster during a visit by Raj's grandmother actually produced a very sweet and romantic ending. By the way, do you know what a saree is? In this story you'll not only find out, but you'll see one! Click here for "The Visit by Grandma" .
On January 1, 2013, Archbishop of Chicago Francis, Cardinal George in a letter to Roman Catholic parishioners wrote that enacting same-sex marriage was "acting against the common good of society", adding, "The state has no power to create something that nature itself tells us is impossible."  For several weeks Pat Brady , state Republican Chairman, lobbied legislators to support the legislation, calling it "an issue of equality and we're the party of Lincoln",  and other party leaders called for his resignation.