Medical maverick Panos Zavos, who claimed last month in London to have implanted a cloned embryo in a woman’s womb for the first time ever, has announced that the attempt has failed and the woman did not become pregnant. He promises more attempts.

A new space race appears to be on—though the contest looks more like an ultramarathon than a sprint. The European Space Agency says it will send astronauts to Mars by 2033.