Without this tiny, ubiquitous shellfish, the story of human life on Earth may have played out quite differently.
Even aside from the gender-neutral issue, toilets have become highly politicised places, especially when it comes to protest.
After centuries of decline and depolulation, the Highlands have thrived under the EU. Now Brexit threatens to turn back the clock.
Anything That Gives Off Light explores Scottishness from three very different perspectives.