The World Ends with a Poot! by Sarah Maloney
In The World Ends With A Poot! Xander tells Raye how Bioandroids came to be on Homeworld. While Xander narrates the scientific history, a lone tardigrade survives multiple mass extinctions and falls through a black hole to find their new home. Apocalyptic sci-fi with a splash of science and a few fart jokes.