The research is looking at the issues from a variety of angles.
Significant research in this field looks at the phenomenon of mental time travel.
Some research has looked at the particular users of online communities.
The research looked at how people use new forms of communication to get work done throughout the day.
Instead, they said, future research should look at what may be going wrong when the practice is done in the field.
Unlike the earlier data, the research did not look at sunshine on Earth.
Their first research, published today, looks at the north in 25 years' time.
Previous research has looked at whether or not a mother was working and how this affected her children.
The research that has been done mostly looks at kidneys.
The latest research looked at 26 published studies into the link.