Human intelligence scores are dropping across the US for the first time, research suggests, and experts warn technology could be to blame.

Since 1905, there’s been a 30-point increase based on scores in logic, vocabulary, spatial reasoning and visual and mathematical problem-solving skills. 

But there are signs that IQ may have dipped, according to a study last year. It found the average IQ score in the US fell from 100 to 98 last year – the first time rates have fallen since we began tracking them.

Now, separate data shows there is a gap of about eight points between states, with New Hampshire ranking first with an average IQ of 103.2.

Those aged 18-22 saw the…