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At the outset of the Industrial Revolution in the late 1700s, about 0.03% of the Earth’s atmosphere was comprised of carbon dioxide. What is it now?

Beyond the last 20 years, when was the last era when the North Pole had expanses of unfrozen water?

What portion of all U.S. energy consumption is provided by wind energy?

Which of the following people wrote in 2012 that “the benefits” of conducting “gain-of-function” experiments on “highly pathogenic” viruses “outweigh the risks”?

Did more people die who received a vaccine or a placebo in the primary clinical trial used by the FDA to approve Pfizer’s Covid-19 vaccine?

More than 400,000 young children participated in the primary study to test the efficacy and safety of the polio vaccine. How many young children participated in the primary study for the Pfizer Covid-19 vaccine?

Did average life expectancy in the U.S. rise or fall in the five years following the implementation of Obamacare?

Barring accidents and negligence, has fracking ever been shown to contaminate groundwater?

Do face masks increase heart and lung stress during vigorous exercise?

Relative to the size of the U.S. economy, is the current national debt larger than any other era of U.S. history?