Ever get frustrated with the leftover ketchup stuck in the bottom of the bottle and try to use a knife to get it out???
Well, look no further for a solution to that problem. Plant researchers, inspired by the near frictionless surface of the Pitcher (type of plant), have found a way to have the ketchup not stick to the bottom of the bottle.
Check out this article:
http://www.telegraph.co.uk/science/science-news/8886117/Graphic-ketchup-bottle-problems-solved.html
Can you think of any problems this will cause besides the one mentioned in the article?
Another method to approach this problem could maybe be by creating an "air-vent" similar to how coffee mugs have a mouth-hole and an air-hole.
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