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Need help /sci/
I just started grad school in physics (phd program). I had taken a grad course on QM at my undergrad, so the advisor recommended I take QFT especially since I was interested in joining the theory group there.
But I feel seriously under prepared for this course. I haven't taken any group theory at all, nor differential geometry.
I'm able to understand only about 70% of the math steps that are talked about in class, however I feel like I'm understanding like 2% of the concepts.
I need to do good in this course, I can't drop it because I need to take so many hours or I get thrown out of the program, and if I don't maintain a certain GPA I get thrown out too. Plus I want to join the theory group eventually so if I ask to join and they see I got a B or C in QFT that will look really bad.
How screwed am I? Can anyone offer advice?
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>While speaking at a conference in 2000, Watson had suggested a link between skin color and sex drive, hypothesizing that dark-skinned people have stronger libidos. His lecture, complete with slides of bikini-clad women, argued that extracts of melanin – which gives skin its color – had been found to boost subjects' sex drive. "That's why you have Latin lovers," he said, according to people who attended the lecture. "You've never heard of an English lover. Only an English Patient."
>On October 25, 2007, Watson was compelled to retire as chancellor of the Cold Spring Harbor Laboratory on New York's Long Island and from its board of directors, after he had been quoted in The Times the previous week as saying "[I am] inherently gloomy about the prospect of Africa [because] all our social policies are based on the fact that their intelligence is the same as ours—whereas all the testing says not really
Does he have a point or is he just a racist person?
Irradiation and stuff
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I have a question for you /sci/ about radioactivity and being exposed to radiations. i've read a lot about disintegration of atoms, nuclear reactions, W/Z bosons, free neutrons and high energy photons...but something escapes me there and I have always been ashamed to ask something that simple.
When you're exposed to X-rays or any ionizing radiation, the body and organism receives a dose of radiation ; but how does the body stores this radioactivity ? does it escapes immediately or does it stays forever inside the body, leading to cellular mutations (pic not related, i hope) being the cause of all the radiation-related cancers and diseases we know.