Hi Marta,

About the type of information that one should find on a label of an
interactive science exhibit, i would say that an hands-on without any
instructions nor scientific explanations nor historical context has no
value at all.  Let the people go in an arcade instead, where they can push,
pull or use their reflex to repletion.

In my point of view, an hands-on is a mean by which one can understand a
scientific principle by experimenting or manipulating objects that are
related to the topic.  The value of an hands-on is in its capacity to help
understand an abstract principle.

Michel Harnois
Science, culture & technologie