I would vote for Sheona, because I really like the way she answers questions and her field of study is one of the coolest thing ever!
Also, some of my best friends are geologists, so I need to keep the geologist pride up or I would get estranged in no time 😛
I would vote for Giuditta! Her answers are fun, and she really tries to explain things well even when they are not from her specific area (heck, she has explained some particle physics questions better than I could!)
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