Evidence Required for Extraordinary Claims: Part One

A phrase has appeared in many popular science books as well as sceptical books about various aspects of the paranormal and pseudoscience’s, but which has, in classic meme fashion, spread to other subjects as well. That phrase is “Extraordinary claims require extraordinary evidence”. However, I feel that phrase has well outlived its original purpose, is total nonsense, and has passed it’s ‘use by’ date by several decades at least. 

There is a phrase, often attributed to the late, and great, Carl Sagan, though I’ve seen others cited as the originator, that “Extraordinary claims require extraordinary evidence”. In fact, if I’ve read that mantra in one science book, I’ve read it in dozens (and then some). Talk about a meme that has infiltrated the scientific community! I mean scientists especially invoke that phrase when applied to, what in their collective judgements are extraordinary claims that they can’t come to rational terms with. I can understand the intent behind the phrase, but not the logic.

Sometimes you hear a song once too often and it loses its appeal. Sometimes it never had any appeal in the first place. In this case, it’s somewhere in-between. I didn’t object to the phrase at first, but after the 1000^th time, and especially upon more sober reflection, I’ve come to the conclusion that it’s a nonsense phrase.

I gather an original purpose was to separate the scientists making scientific claims, backed by independent verification and peer review, from the non-scientists making pseudo-scientific (i.e. – extraordinary) claims. This was all with the view on the grounds scientists don’t have the time and inclination to investigate every pseudo-scientific claim, so if they are to take the great unwashed seriously, a truckload of evidence had better be presented to them – far more than would be required initially from one of their peers. While that makes a bit of sense, it perpetuates an us vs. them dichotomy and makes scientists more elite than they really are, and/or makes the great unwashed even more unwashed than they really are. Anyway, this you’d better dump on me an extraordinary amount of evidence in my lap before I take you seriously (and even then I’ll probably take you with a grain of salt because I doubt I’ll have the right time of day for you because my mind is made up so don’t confuse me with facts or evidence) has become enshrined in the ‘extraordinary claims require extraordinary evidence’ mantra. 

Now at the onset, let me state that claims require evidence. That is not in dispute. That philosophy is an absolutely central concept part and parcel of our modern civilization. The entire foundation of our legal system answers to that principle. The scientific community, peer review, has adopted that principle. Even in everyday personal life, we insist on the viability of that principle. I mean if you claim you have a red dress, some doubting Thomas is perfectly within his rights to make you prove it – provide the evidence. And so you go to your closet, bring out the red dress, and so prove your claim. Now if you claim to have 1000 red dresses, which may seem like an extraordinary claim, but the nature of the evidence is exactly the same. You go to your closet, drag out 1000 red dresses, and dispatch Mr. Doubting Thomas quick-smart.

Oh, there is one great exception to the ‘claims require evidence’ principle – religion. When it comes to religious claims, however outrageous and illogical then may seem, you don’t have to provide any evidence, extraordinary or otherwise. It’s all about blind faith – faith is the be-all-and-end-all when it comes to believing in – to be honest – unsubstantiated claims.

Now the problem is that the work ‘extraordinary’ is in the mind of the beholder. What’s extraordinary to one individual isn’t even remotely extraordinary to another. It’s an emotive, personally judgmental word.

If I claim there’s a blue sedan parked in my driveway, that’s an ordinary claim.

If I claim there’s a ‘flying saucer’ parked in my driveway, you’d say that’s an extraordinary claim. However, both claims, ordinary or extraordinary, require the exact same amount of evidence. 

In the no-nonsense legal world, there’s no need for extraordinary evidence. You don’t require twice or thrice the number of witnesses to convict in the case of murder vis-à-vis shoplifting, even though murder is a far rarer and more extraordinary crime than shoplifting.

You go to the bank. Whether you withdraw an ordinary $1 or an extraordinary $10,000, you will be required to produce evidence that you are who you say you are – your signature, and perhaps photographic identification. But, in either case, it’s the same evidence.

To be continued…