The Download: the secrets of vitamin D, and an AI party in Africa

The article discusses the importance of vitamin D supplementation, especially for those in regions with limited sunlight exposure. It also highlights an AI conference in Africa where attendees aim to secure job opportunities and promote homegrown ventures in the AI field. Additionally, it mentions Google's new image generator with loose guardrails and provides a list of tech news stories, including Taiwan's chip tariff support and concerns about mental health chatbots.