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"Radioactive waste and toxic mining byproducts will remain deadly for thousands of years – maybe forever. Generations in the distant future will need to know about the places this stuff is buried, and to stay away. Deep in the arsenic-contaminated underground at Giant Mine near Yellowknife, contributor Garth Mullins wonders how we can warn the distant future. Is it even possible to send messages that can outlast governments, languages, cultures, nations – maybe even humans?"