Misc: It takes how many muscles to frown?

Questions

[science and technology] who discovered x-rays in 1895?

[science and technology] granny smith, james grieve and egremont russet are all types of which fruit?

[science and technology] what is the name of sugar found in fruit?

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

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