A scientist in China claims to be the first to gene edit a pair of twins. But his 'breakthrough' has triggered controversy - even condemnation - for the way in which it was carried out. But I'm also concerned by the door he's opened stigma and discrimination against people living with HIV. Professor Sharon Lewin, Director of the Doherty Institute, who's searching for the AIDS cure, tells me why she shares those worries.

(FOCUS Podcast is a weekly global affairs podcast presented by James Chau, and brought to you by China-US Focus)