This week, Stu looks at the effectiveness or not of platelet-rich plasma for treating musculoskeletal injuries in sports medicine, and for so-called vampire facials in beauty treatment; and Chris digs into a new study on the physics of flight and the surprisingly simple formula for the frequency of flapping wings, which he then uses to calculate whether a human could fly by flapping their arms.Jensen JH, Dyre JC, Hecksher T (2024) Universal wing- and fin-beat frequency scaling. PLOS ONE 19(6): e0303834. https://doi.org/10.1371/journal.pone.0303834