Grants are usually for projects. Projects may include a portion for postgraduate students, but also pay a lot of other things such as running costs for a lab, t

Grants are usually for projects. Projects may include a portion for postgraduate students, but also pay a lot of other things such as running costs for a lab, travel, conference fees, etc. The costs of running, say, a biology lab are very high (lots of equipment, need to employ technicians as well).