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Anonymous
speed of light is different in different materials. Light going through water moves at different speed then light going through air, etc, etc. difference causes refraction when observed by human eye.
side note: Some physiscists have made crazy-ass contraptions that have slowed light down to less than 1mph. Also, for a while now we have had high speed cameras that are fast enough to stop-motion light. I wish I could find an example picture because they're bad ass.
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