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In other words, we need to be able to tell when we believe or disbelieve in something based on high standards of evidence and when we are just engaging in a bit of motivated reasoning and letting our opinions take over. When we withhold belief because the evidence does not live up to the standards of science, we are skeptical. When we refuse to believe something, even in the face of what most others would take to be compelling evidence, we are engaging in denial. In most cases, we do this because at some level it upsets us to think that the theory is true.

So how to tell a fact from an opinion? By the time we sit down to evaluate the evidence for a scientific theory, it is probably too late. If we take the easy path in our thinking, it eventually becomes a habit. If we lie to others, sooner or later we may believe the lie ourselves. The real battle comes in training ourselves to embrace the right attitudes about belief formation in the first place, and for this we need to do a little philosophy.

No historian can claim to have insight into the motives of living individuals. But history does show that a heightening of rhetoric against a certain group can incite violence against that group, even when no violence is called for. When a group is labeled hostile and brutal, its members are more likely to be treated with hostility and brutality. Visual images are particularly powerful, spurring actions that may well be unintended by the images’ creators.

Using data from more than 330,000 doctors and 12 pharmaceutical firms, it identified 58% as having received payments. It found that payments were unlikely to represent significant opportunities to educate doctors about new drugs, and that financial gain appears to be an important motive for doctors. Daniel Carlat, director of the prescription project at the non-profit group Pew Trusts, says research to date shows that doctors who have dealings with drugs reps "tend to prescribe differently". "They prescribe more drugs, more expensive drugs, more brand-name drugs, and they're less likely to follow evidence-based practice guidelines in prescribing drugs.