One in five Canadians has at least one tattoo, including Prime Minister Justin Trudeau, who sports a Haida symbol on his left shoulder. Tattoos have moved into the mainstream, companies have begun to relax rules on visible tattos in the workplace. The new exhibition charts the journey of tattooing from its deep historical and global roots, via its marginalizaiton, to its current revival in many cultures around the world. Here are six essential tattoo terms to know while walking through the Tattoos exhibition:

David Evans and Michael Ryan reveal a spectacular new species of ceratopsian, Wendiceratops was approximately 6 metres from nose to tail and weighed more than a ton (2,000 lbs).

Guest blog by Shiona M. Mackenzie.

Glass is probably the most fluid of solids. Looking at blown glass, such as that in the ROM's Chihuly exhibition, is like watching movement made still. If you look carefully at the handles of the perfectly preserved handles of this Roman glass vase from Syria (above), it looks as though it is still a fluid, still dynamically moving along its flow. In a way, that is because it is. Glass essentially has the atomic structure of a fluid, but it has been so rapidly cooled that it is essentially stuck in that condition.