Tapeworms are parasitic flatworms of the class Cestoda that live in the digestive tracts of vertebrates and steal vital nutrients from their hosts. Most human tapeworm infestations result from the consumption of contaminated meat or fish that has not been properly cooked. An adult tapeworm consists of a knoblike head, or scolex, equipped with hooks for attaching to the intestinal wall of the host, a neck region, and a series of flat, rectangular body segments. How long can tapeworms grow to be?
Back in the day
The German term Anschluss, meaning "unification" or "political union," is most frequently used in reference to the Nazis' 1938 annexation of Austria into Greater Germany. When the Nazis entered Austria to enforce the Anschluss, they encountered no military opposition and quickly took control of the newly created German province. The US, USSR, and UK signed a declaration proclaiming the Anschluss null and void in 1943, yet Austria did not regain its sovereignty until what year?
Born on a day like today
German physicist Gustav Kirchhoff was a pioneering scientist who contributed to the fundamental understanding of electrical circuits, spectroscopy, and the emission of black-body radiation by heated objects. He formulated a number of eponymous laws which explain the activity of both electrical circuits and thermodynamic reactions. In 1861, Kirchhoff and Robert Bunsen, inventor of the Bunsen burner, co-discovered what two chemical elements while studying the spectral signature of the sun?