The EPA argues that it doesn't have the authority to regulate carbon dioxide emissions. Yet on another subject (as a result of a court order) it is extending its jurisdiction a million years into the future: planning and warning, for whoever might be hanging around by then, about the danger of the nuclear waste storage site at Yucca Mountain.
A winning design in the Desert Space Foundation's competition for warning signs at Yucca Mountain. How do we think Earthlings in a future we cannot imagine would interpret this image?
Closer in time, a 2,000-year-old computer is discovered fathoms deep in the ocean. "One of the remaining mysteries is why the Greek technology invented for the machine seemed to disappear. No other civilisation is believed to have created anything as complex for another 1,000 years."