damaged.
some worker spaces on the main board have a requirement that you must fulfill in order to place a worker there. these requirements are shown inside the worker space.
if a worker space shows a scientist or an engineer, then you may only place a worker of that type in the space. if no worker is shown, then any worker may be placed in the space.
some worker spaces show two different requirements, separated by a slash (/). when you place workers on one of these, you must fulfill either of the two requirements (not both).
for example, the right worker space in the green factories section of the main board shows an 