Why Sex Chromosomes Matter When It Comes to Heart Disease

Most mammals, including humans, have two sex chromosomes, X and Y. One sex chromosome is usually inherited from each parent, and they pair up as either XX or XY in every cell of the body.   People with XX chromosomes typically identify as female, and people with XY chromosomes typically identify as male. The genes … Read more

Watch how a lizard cuts off its own tail to escape danger | Science

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