SpaceFiguring out what the Milky Way looks like is akin to a murder mystery How can we get a picture of the whole Milky Way if we are inside it? Good sleuthing is needed to combine all the clues, writes Chanda Prescod-Weinstein Comment
HealthThe global failure to push PrEP is hindering the fight against HIV The UN set a target of 3 million people on the HIV prevention drug PrEP by 2020 – but lingering prejudice and sheer ignorance of its existence mean we're nowhere near Comment