Read this excerpt from A Black Hole Is NOT a Hole. In the 1930s a telephone-company engineer named Karl Jansky was trying to track down the cause of hissing static in phone lines when he discovered something strange. Radio energy from outer space was interfering with the phone signals. After learning about Janksy's discovery, a radio engineer named Grote Reber decided to investigate. The connection between Karl Jansky and Grote Reber in the excerpt shows that both men were interested in telephone static. Grote Reber was Karl Jansky’s student. Karl Jansky influenced Grote Reber’s work. both men were searching for black holes.

Karl Jansky influenced Grote Reber’s work.

Explanation:

In this excerpt, we learn about the ways in which these two people (Karl Jansky and Grote Reber) were connected. We learn that Jansky was responsible for an important discovery related to telephone static. He realized that radio energy from outer space was interfering with the telephone signals. Afterwards, this discovery influenced Grote Reber's work. Reber was influenced by this because Jansky's discovery encouraged him to investigate more.

"choosing is refusing" means individuals face an opportunity cost with each decision they make. economists state that every decision involves trade-offs. opportunity cost is the least desirable alternative given up as a result of a decision.

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