When Homo sapiens self-destructs and takes much of the world with it, what will remain? Lego and tardigrades, predicts Sandy Edwards, who is among many readers to nominate the mighty, tiny tardigrade. Edwards, from St Andrews in Scotland, says: “Survivalists! When it comes to the end of the world, they, and Lego, are all that will remain!” Mirko Tosoni, based in Amsterdam, is another fan. “They are the only one who ever survived five mass extinctions on Earth – talk about resilience! They also live in the most uninhabitable places, from the moon to the deepest sea, and yet are