by Welkin John­son — How does one even be­gin to in­ves­ti­gate the nat­ural his­tory of viruses? The di­nosaurs be­queathed a mot­ley as­sort­ment of bones, teeth, foot­prints strid­ing 'cross an­cient riverbeds, fos­silized eggs, the oc­ca­sional co­pro­lite. The tiny trilo­bite left last­ing and ubiq­ui­tous im­pres­sions, find­ing its way into...