Place{{Project Mercury}} at the end of an article, but above any categories.
This template'sinitial visibility currently defaults toautocollapse, meaning that if there is another collapsible item on the page (anavbox, sidebar, ortable with the collapsible attribute), it is hidden apart from its title bar; if not, it is fully visible.
To change this template's initial visibility, the|state=parameter may be used:
{{Project Mercury|state=collapsed}} will show the template collapsed, i.e. hidden apart from its title bar.{{Project Mercury|state=expanded}} will show the template expanded, i.e. fully visible.{{Project Mercury|state=autocollapse}} will show the template autocollapsed, i.e. if there is another collapsible item on the page (anavbox, sidebar, ortable with the collapsible attribute), it is hidden apart from its title bar, but if not, it is fully visible.