It isn't illegal to chew gum, but it is illegal to bring them into Singapore or sell them except for medical purposes. Since you can't buy gum (selling is illegal) there's no way to chew them so it's almost as good as not being able to chew gum. See this: http://www.customs.gov.sg/leftNa...
Definition: In Vitro. A study done in vitro, in contrast, looks at how a drug or procedure responds in the confines of a test tube or laboratory dish. Clinical trials or medical studies may be performed either in vivo or in vitro.
Cultured Meat; manufacturing of meat products through tissue-engineering technology. In-Vitro meat is the (idea of) manufacturing of meat products through tissue-engineering technology. Cultured meat (= in-vitro meat) could have financial, health, animal welfare and environmental advantages over traditional meat. The idea: To produce animal meat, but without using an animal.