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Your voice really does fit for this type of read, you sound knowledgable but approachable and warm! I agree with Bill that I think your pauses at commas are interrupting the flow of your sentences, and making it sound a bit unnatural, and actually making the listener have to work harder to understand the piece as a whole.
One other piece of feedback I have is that perhaps the list in the first sentence could afford a little more specificity in each item – how are blue nitrogen skies, oceans of liquid water, cool forests, and soft meadows different from one another?