[https://www.usefulscience.org/podcast/38](https://www.usefulscience.org/podcast/38)The Useful Science team provides a breakdown on clinical trials - what they are, why they matter, and how long they take. As a wave of urgent clinical trials related to COVID19 is unfolding around the world, researchers try to balance the need for vaccines & treatment with ethical concerns and the health of study participants.Music by [Solomon Krause-Imlach](https://solomonkrauseimlach.com/).Follow us @usefulsci or email us at [podcast@usefulscience.org](mailto:podcast@usefulscience.org).## Show Notes* [Ethics of controlled human infection to address COVID-19](https://science.sciencemag.org/content/368/6493/832)* [What risks should be permissible in controlled human infection model studies?](https://onlinelibrary.wiley.com/doi/full/10.1111/bioe.12736)