How did the invisible man first become visible?

Name: Zigya - For The Curious Learner
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Question

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Anonymous · Accepted Answer

Griffin, the invisible scientist first became visible when he happened to step in some mud, which caused him to leave footprints as he walked. His footprints were seen by two boys, who followed him as long as the prints were visible.

Footprints without Feet

How did the invisible man first become visible?