there's always uncertainty. Find out what 5 sigma is to see the kinds of standards for truth and discovery that physicists have, and compare that to any other "science" like modern macro-economics.
If you really want to be sure about any opinion you might want to have, take a graduate course in particle physics. Make sure to do well in all the math per-requisites. Otherwise, your choice to believe either way is founded on more than shaky grounds. Not the kind of life I'd like to lead.
"I never submitted the whole system of my opinions to the creed of any party of men whatever in religion, in philosophy, in politics, or in anything else where I was capable of thinking for myself." - Thomas Jefferson
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