As a palaeontologist Tori Herridge spends her life poking at things from the past, but she's secretly obsessed with the future. Here, she explores how future cities might work, taking a leap from Earth to Mars. Space engineer Dr Gisela Detrell has a day job researching how to keep astronauts alive in space for longer, but she's also been working out how one million people could manage to make a home on Mars
