The term 'compelling' in the text means convincing and persuasive. It is typically used to describe engaging and persuasive arguments that leave a lasting impact on the audience.
Compelling in the context provided means convincing. In the text, when the speaker refers to Dr. David Clarke's case about a UFO in Scotland as compelling, they are highlighting how his presentation was persuasive and held their attention.
This term is often used in academic writing to describe arguments or presentations that are persuasive and engaging, making the audience believe or consider the information being shared.
For instance, in the sentence, 'The most compelling case I ever had the chance to hear was from Dr. David Clarke,' the speaker emphasizes that Dr. Clarke's talk was very convincing and left a lasting impression on them.
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