Sequencing the Y chromosome, smart bird brains, testing with your gut, new COVID vaccines and more

KSQD 10-11-2023: Testing for VO2 max; New COVID Vaccine availability is poor; The mysteries of the Y chromosome; The differences in bird brains that allow them to be just as smart as many mammals; Nerves involved in taste both in the tongue and the intestines; Is a rash after COVID vaccine associate with an autoimmune reaction? Schizophrenia raises cholesterol