The red color shows that you are speaking too fast. The blue color shows that your are speaking too slow. If the color is green it means that you are presenting your pitch in the optimal speed for your listeners to follow.
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The thing I'm particularly interested in is natural history. In its heyday, the mid- and late-nineteenth century, when people were going out and gathering the first huge caches of data and trying to understand what was living and growing everywhere, there was such a sense of freshness to that pursuit. It's very exciting.