Problem: The presence of the Virgin Mary under the cross[Jn. 19:26-27] has in itself been the subject of Marian art, and well known Catholic symbolism such as the Miraculous Medal and Pope John Paul II's Coat of Arms bearing a Marian Cross. And a number of Marian devotions also involve the presence of the Virgin Mary in Calvary, e.g., Pope John Paul II stated that "Mary was united to Jesus on the Cross". Well known works of Christian art by masters such as Raphael (e.g., the Mond Crucifixion), and Caravaggio (e.g., his Entombment) depict the Virgin Mary as part of the crucifixion scene.
What symbol is popular in Marian Art?
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Answer: Marian Cross

Problem: The photoelectric effect is the emission of electrons (called "photoelectrons") from a surface when light is shone on it. It was first observed by Alexandre Edmond Becquerel in 1839, although credit is usually reserved for Heinrich Hertz, who published the first thorough investigation in 1887. Another particularly thorough investigation was published by Philipp Lenard in 1902. Einstein's 1905 paper discussing the effect in terms of light quanta would earn him the Nobel Prize in 1921, when his predictions had been confirmed by the experimental work of Robert Andrews Millikan. The Nobel committee awarded the prize for his work on the photo-electric effect, rather than relativity, both because of a bias against purely theoretical physics not grounded in discovery or experiment, and dissent amongst its members as to the actual proof that relativity was real.
Who first observed the photoelectric effect?
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Answer: Alexandre Edmond Becquerel

Problem: The Endangered Species Conservation Act (P. L. 91-135), passed in December, 1969, amended the original law to provide additional protection to species in danger of "worldwide extinction" by prohibiting their importation and subsequent sale in the United States. It expanded the Lacey Act's ban on interstate commerce to include mammals, reptiles, amphibians, mollusks and crustaceans. Reptiles were added mainly to reduce the rampant poaching of alligators and crocodiles. This law was the first time that invertebrates were included for protection.
What two reptiles were particularly of interest for the inclusion of "reptiles" in the Endangered Species Conservation Act?
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Answer:
alligators and crocodiles