Misc: What is the official language of Chile?

Questions

[science and technology] from which language does the term 'eureka' come?

[science and technology] which fruit has the latin name of malus oumila?

[science and technology] what type of animal is pulex irritans?

[science and technology] in dyeing what is the name given to the substance used for fixing the colour?

[science and technology] what is the name given given to the lowest temperature theoretically possible?