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From the late 19th century, the South used a colloquial term, the one-drop rule, to classify as black a person of any known African ancestry. This practice of hypodescent was not put into law until the early 20th century. Legally the definition varied from state to state. Racial definition was more flexible in the 18th and 19th centuries before the American Civil War. For instance, President Thomas Jefferson held persons who were legally white (less than 25% black) according to Virginia law at the time, but, because they were born to slave mothers, they were born into slavery, according to the principle of partus sequitur ventrem, which Virginia adopted into law in 1662.

When was the "one-drop" rule put into place?
Answer: early 20th century.
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Relations between Ashkenazim and Sephardim have not always been warm. North African Sepharadim and Berber Jews were often looked upon by Ashkenazim as second-class citizens during the first decade after the creation of Israel. This has led to protest movements such as the Israeli Black Panthers led by Saadia Marciano a Moroccan Jew. Nowadays, relations are getting better. In some instances, Ashkenazi communities have accepted significant numbers of Sephardi newcomers, sometimes resulting in intermarriage.

Where was Saadia Marciano from?
Answer: Moroccan Jew
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Orientation behaviour studies have been traditionally carried out using variants of a setup known as the Emlen funnel, which consists of a circular cage with the top covered by glass or wire-screen so that either the sky is visible or the setup is placed in a planetarium or with other controls on environmental cues. The orientation behaviour of the bird inside the cage is studied quantitatively using the distribution of marks that the bird leaves on the walls of the cage. Other approaches used in pigeon homing studies make use of the direction in which the bird vanishes on the horizon.

How are orientation behavior studies traditionally carried out?
Answer:
the Emlen funnel