'They are essential': How smoke detectors are evolving

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They can even go direct to the Twig's factory in the city of Shawano to have the same bottles refilled. Some are vintage ones still going strong after 60 or so years.

The woman who ultimately discovered the superior features of agar as a growth medium and brought it to Koch’s attention was Fanny Angelina Hesse. Her foundational contribution to the nascent field of microbiology is often omitted from textbooks. In other cases, she is unflatteringly referred to as a “German housewife” or as “Frau Hesse,” or dismissed as an unnamed technician.

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