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Blood type AB negative is the rarest blood type in the world, with only about 0.6% of the world's population having it. This blood type is rare because it requires a person to inherit both the A and B antigens as well as the Rh factor.

Joseph Lister, influenced by the work of Louis Pasteur, was the pioneer of antiseptic surgery. He introduced carbolic acid as an antiseptic, drastically reducing post-surgery infections.

Vitamin K is essential for blood clotting, and a deficiency can lead to excessive bleeding.

Tobacco use, particularly smoking, is the single leading preventable cause of death globally, causing many types of cancer, heart disease, and lung diseases.

Willem Einthoven invented the electrocardiogram, a tool to measure and depict the electrical activity of the heart, for which he received a Nobel Prize in 1924.