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In 1938, Helmut Ruska, a German physician and biologist, saw the potential of the electron microscope in the application to the field of biology. Helmut collected images, including the variola virus (which causes smallpox) and presented images of the virus particles at a meeting of the Medical Society of Berlin.
Nearly 80 years later, the electron microscope can identify all kinds of pathogens. There are an estimated 1.67 million viral species yet to be discovered.
As a part of Nordic marriage rites during the 5th century, it’s believed that it was a tradition for newlywed couples to consume copious amounts of mead (a fermented honey drink) during the first full moon cycle, or month, of marriage. The practice is one of several proposed origins of the honeymoon’s etymology.
Shark skeletons are very different from those of bony fish and terrestrial vertebrates. Sharks and other cartilaginous fish (skates and rays) have skeletons made of cartilage and connective tissue.
Cartilage is flexible and durable but is about half the normal density of bone.
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