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Comments to #2
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Cecilia 3 year s ago
#6 'Reflect back' is redundant. Ergo and therefore mean the same thing, ergo they are redundant.
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Lester 3 year s ago
hiya boys, did you miss me?
Why do plastic soda bottles have bumpy bottoms while water bottles don’t?
The bumps are there to increase the strength of the bottle. This is necessary because the plastic bottle must be able to withstand the pressure of the gas in soda.