[The Conversation Africa] Namibian athletes Christine Mboma and Beatrice Masilingi began to make headlines in 2021 for their exceptional 400-meter sprint times. In July, it was confirmed that the 18-year-old athletes had been barred from the 400m event at the Tokyo Olympics because of too-high natural testosterone levels according to World Athletics' track and field rules. (The rules don't apply to the 200-meter sprint and they both qualified for this, with Mboma finishing second.) This ongoing 'sex testing' controversy also dashed