We are getting dumber, but science still has no answer as to why!

We've done anything stupid before in the 20th century (and, as you know, there were quite a few), we had at least one thing to brag about: human IQ was increasing and we humans were getting smarter in this segment at least. A steady rise in IQ is known as The Flynn effect and this lasted for decades: IQ is supposed to be like this increased by about 3 points every decade.

But the latest research brings worrying results: the trend is reversing. We probably wouldn't be so worried if IQ was decreasing for a small percentage of the population, because both food and education can affect this, but they differ from group to group. After new studies but it seems that this is not only happening to a smaller segment of the population, but to all Norwegians.
When scientists from the Norwegian Ragnar Frisch Center for Research in Economics analyzed 730 thousand intelligence tests, completed by Norwegians before the start of compulsory military service (from 1970 to 2009), found that average test scores dropped– And this drop is not negligible. Every generation of Norwegians is supposed to be dumber by as many as 7 points. And as he notes PsyBlog, this is not the first study, with which they found out, that the Flynn effect is working on you, although it is true that this time she is the most convincing.

The Million Dollar Question: Why?

This is pretty terrifying news for fans of progress, but it also raises an extremely important question: why? What's wrong, that our IQs are falling?
First of all, we might think that it all starts with genes. Perhaps these changes were influenced only by a certain group that was studied (roughly speaking, this is the "stupid people have more children" hypothesis). But this was eliminated by a new study, where they proved that even in families with one child there was a decline in IQ. Tyler Cowen, blogger (Marginal Revolution) and economist, summed up what this means: “In other words, we've started to build an environment that breeds more stupidity.”

So that's how we know it is education rather than nature is the culprit, but scientists are still puzzled as to which aspect of modern life is to blame for this decline. Some believe she is guilty obsession with technology, but assuming that the decline in IQ is said to have started as early as the 1970s, long before people spent their days glued to screens, this cannot be the main reason.
Still others say it's their fault unhealthy modern diets, more and more fake media and ever worse quality of education and the prevalence of reading.

Perhaps the reason for this could even be found in the technicalities of IQ tests. Scientists distinguish between crystallized intelligence (everything we learned and remembered) and 'liquid' intelligence (our abilities to learn new things). IQ tests generally measure crystallized intelligence, so changes in schooling that no longer emphasize memorization may affect IQ decline. If this explanation is true, then students today are smarter than ever before (just more dependent on Google).

What causes a decline in intelligence, remains a mystery. Whatever turns out to be the culprit, we should probably start to worry, what can our sitting, technology and fast food obsessed lifestyles do to our brains.