People that excel in mathematics and science are not a threat. However, if you mean "traits", then people that excel at math and science are generally inquisitive, critical thinking, analytical, and very good at paying attention to detail.
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It's correct to say that a person is good AT mathematics.
Being good on mathematics is a sign that a person probably is good on all other disciplines, unless that person is not interested on anything else.
No single person made mathematics: it was, and continues to be, the combined effort of thousands of mathematicians.
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Mathematician