SCOTLaND S newest hub for health, science and sports education opened its doors to 5070 students and staff yesterday.  The Edinburgh Napier University building, designed by RMJM architects and Buro Happold engineers, was built on the existing campus in Sighthill, in the west of the city.  Students from the faculty of health, life and social sciences will use the campus.  Low carbon emissions and effective overall energy performance play a key part of the design. During construction, 8000m3 of demolition material was recycled and incorporated into the building.  Dame professor Joan Stringer, principal and vice chancellor of Napier, said: The architectural wow  factor and innovative facilities combine to make it a first-class environment in which to learn.