Hernan Ebbinghaus discovered that the rate at which we forget newly learned information is initially

Hernan Ebbinghaus discovered that the rate at which we forget newly learned information is initially very rapid and then it slows down.

Explanation:

Hernan Ebbinghaus was the first psycology to investigate memory through an experimental method. He experiment on repetitions and the time related to remembering and forgetting, he invented what is called Ebbinghaus forgetting curve. That is why he discovered the importance of repetition in order to remember.