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Various geologic, atmospheric and solar processes can influence atmospheric carbon-14 levels.Since the 1960s, scientists have started accounting for the variations by calibrating the clock against the known ages of tree rings.By measuring the ratio of the radio isotope to non-radioactive carbon, the amount of carbon-14 decay can be worked out, thereby giving an age for the specimen in question.But that assumes that the amount of carbon-14 in the atmosphere was constant — any variation would speed up or slow down the clock.The reluctance of many scientists to accept the concept of continental drift was rooted not only in reservations they had about the nature of the evidence cited to support the novel theory, but also in concerns about the very kind of theory it was.To understand why the theory of continental drift seemed so unacceptable to earth scientists during the twentieth century, it helps to understand the guiding methods of geology that had been developed during the previous two hundred years.The clock was initially calibrated by dating objects of known age such as Egyptian mummies and bread from Pompeii; work that won Willard Libby the 1960 Nobel Prize in Chemistry.But even he “realized that there probably would be variation”, says Christopher Bronk Ramsey, a geochronologist at the University of Oxford, UK, who led the latest work, published today in Science.

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I was their Shared Services Associate, so I was in charge of pretty much all of the back-end HR stuff, finance and office management. Jessie: So what kind of work are you doing with your organization? I am writing an article right now for the survey; one in English and one in Spanish, and hopefully someone will translate it into Portuguese.

Shelby: I studied History, Political Science, and Arabic Language. Shelby: Yes, I studied abroad in Tunisia, and then in Jordan when I was in college.

I have history doing research, but nothing on public health as such – but that’s what I’m looking to get into. That experience has been helpful, because the “inshaallah” attitude is very similar to the “ojala que” in Bolivia – that “maybe it’ll get done, maybe it won’t – we’ll see” attitude.

On Nov 9th, 2015, I interviewed Shelby Marie about her fascinating work with HIV/AIDS and Sustainable Bolivia partner organization Vivo en Positivo.

She told me how interning and volunteering has improved her career prospects: it has allowed her to move into her chosen field, travel, work on her Spanish and get some amazing work experience. Here’s her awesome story (includes swear words): Jessie: So what’s your background?




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“Well, there goes another night that reinforces I will not meet a guy I like in this town.” Little did I know, I had already met my future husband that night. Once I realized that several people in our group had never been to the DC institution that is Dan’s Café, I forced them to all go inside the boarded up shack and drink whiskey from a ketchup squeeze bottle. That, and a great juke box, surly bartenders, and the smelliest bathroom this side of the Mason Dixon).


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