Indian Prime Minister Narendra Modi remains the most popular leader in India, according to the US based Pew Research Center, in a survey that underscores the trust people have in him, even with the rumblings over a dip in economic growth.

The image of the United States has deteriorated sharply across the globe under President Donald Trump and an overwhelming majority of people in other countries have no confidence in his ability to lead, a survey from the Pew Research Center shows.

Those who read consistently exhibit significantly greater memory and mental abilities at all stages in life.

A global survey of 40 countries finds that large numbers of people have a favourable opinion of the United States, its economy and the US-led fight against the Islamic State.