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Why Mythbusters never debunked dowsing

Puppycow

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This is a YouTube video from Adam Savage.


I won't spoil it if you would like to watch the video yourself to see why. Otherwise, I'll give a brief summary and my comments in spoiler tags:

It seems to come down to that he didn't want to be a meanie because so many people believe in dowsing and he didn't want to bring a sincere dowsing believer on the show and embarrass him/her. Weird, huh? Is there no way to do this without being a jerk about it? And I understand that they would steer clear of controversial topics like religious beliefs, but giving a pass to dowsing because you don't want to be a meanie? It's something that can actually be tested too. Some things are not easy to test, but dowsing is. Randi did it.
 
Chris French also did some tests of dowsers which, unsurprisingly, showed that it didn't work. The dowsers were downcast, for a short while, but then found ways to rationlise their failure and left with their belief in dowsing apparently undimmed. (Dawkins is mentioned as he was presenting the programme, Chris French did the experiments.)

 
By coincidence I just watched that last night. I missed the livestream that featured the question.

I think he was right, they weren't about public shaming of people.
 
Part of his rationalising was interesting - in that maybe dowsing *does* work in a "natural" environment where people are subconsciously picking up environmental clues.

Extremely difficult to test that in some sort of controlled environment, vs the buried bottle of water type of thing. Anyone know of any attempts?
 
Part of his rationalising was interesting - in that maybe dowsing *does* work in a "natural" environment where people are subconsciously picking up environmental clues.

Extremely difficult to test that in some sort of controlled environment, vs the buried bottle of water type of thing. Anyone know of any attempts?
Part of the problem is that in 'natural' settings, where people are looking for sources of water, if you dig down far enough, you're pretty much guaranteed to find water eventually, at least in countries like the UK.

The trouble comes when dowsers attribute this to magically detecting water, and make a more specific claim about hazel twigs and bent coathangers, which can then be tested and shown to be false.

When they are confronted with this, they have the choice between admitting they were deluding themselves, or with continuing to believe they have special powers, which were somehow interfered with by the experimental conditions.
 
Part of his rationalising was interesting - in that maybe dowsing *does* work in a "natural" environment where people are subconsciously picking up environmental clues.

Extremely difficult to test that in some sort of controlled environment, vs the buried bottle of water type of thing. Anyone know of any attempts?
You’d need to demonstrate that the subconscious works in such a way before you start to use it as an explanation for anything. That aside, the JREF challenge was always careful to only test the claim the dowsers made, if the dowsers themselves believe they can do X then testing for X is done. And the actual test was mutually agreed prior to the testing, if both sides couldn’t agree then no test went ahead. None of the dowsers who wanted to be tested could do what they claimed they could when doing a test they had agreed to.

ETA: With the dowsing challenges usually the first test run was done with the dowsers knowing where whatever they were dowsing for was, the dowsers would agree that their dowsing was working under such test conditions, then the samples would be moved about and (as an example) the top of the box was closed. Subsequent test runs resulted in what one would expect by chance alone.
 
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I recall Randi saying that it would be impossible to fail to find water in the ground. Even in Australia, a very large percentage of the continent, including desert regions, has artesian water beneath it. Dowsers, like all people who think they have some "gift" like this, have convinced themselves first. So they will be the last and hardest to unconvince.
 
Part of his rationalising was interesting - in that maybe dowsing *does* work in a "natural" environment where people are subconsciously picking up environmental clues.

Extremely difficult to test that in some sort of controlled environment, vs the buried bottle of water type of thing. Anyone know of any attempts?
 
When we set up the Beehive Skeptics booth at festivals, we offer dowsing as a demo. Totally unscientific, of course, but we have a series of covered containers, only one of which has water in it. Visitors can use our dowsing rods (or bring their own) and try to tell which container has the water.

I see what Adam is on about, though. Mythbusters tried to stay focused on the ideas, not the people embracing them.
 
This is a YouTube video from Adam Savage.


I won't spoil it if you would like to watch the video yourself to see why. Otherwise, I'll give a brief summary and my comments in spoiler tags:

It seems to come down to that he didn't want to be a meanie because so many people believe in dowsing and he didn't want to bring a sincere dowsing believer on the show and embarrass him/her. Weird, huh? Is there no way to do this without being a jerk about it? And I understand that they would steer clear of controversial topics like religious beliefs, but giving a pass to dowsing because you don't want to be a meanie? It's something that can actually be tested too. Some things are not easy to test, but dowsing is. Randi did it.

Adam Savage should check his premises showing dowsing is bunk is not being a jerk. It is showing dowsing is bunk.
 
Why'd he even answer the question, who cares? The show was always more entertainment than some sort of documentary, what would explode if they did a bit on dowsing. Would have been out of character if for the show if you ask me.
 
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Yeah, it's a weird take. Randi was calling out famous charlatans, with lackluster results. He wasn't trying to disabuse people of their folk traditions and petty superstitions. And neither was Mythbusters.
 
"Adam, Jamie, for the hundredth time, the channel's not going to send you on a round the world cruise to 'test' the 'myth' that the Earth is flat!"
 
I understand that Adam has gotten a little snippy for being called Jamie at times. I still think of him as "Jamie" because he looks like a Jamie. I had one student that looked a lot like him, name = Jamie. Even on Mythbusters Jr. I'm still a little surprised when the kids call him Adam.
 
Part of his rationalising was interesting - in that maybe dowsing *does* work in a "natural" environment where people are subconsciously picking up environmental clues.

Extremely difficult to test that in some sort of controlled environment, vs the buried bottle of water type of thing. Anyone know of any attempts?
That is why Randi always gave the dossiers a “dry” run where they could prove to themselves that they were in surroundings where their dowsing still worked, despite the unnatural surroundings (and negative vibes from the skeptics).

Once that is established, the real testing began where the dowsing invariably failed,
 
It seems likely that both the boring and the pouring would happen after locating the water source.

But first I must think about this deeply for an extended time.
 
I posted this before on here on a previous dowsing thread, but first of all, I have to say that like the tests have proven, claims of special powers under controlled conditions, have alwaysbeen negative.

My boss back in 1983, commissioned a local dowser to find a water pipe in his front garden. I watched the process from the start as I was living in an apartment overlooking the garden. The task was to find where the pipe terminal was located. The dowser although he lived in the area, did not know this property personally. He used the coat hanger technique, and rather like an archaeologist using magnetic resonance devices, walked and tracked a route backwards and forwards progressively across the garden area. Every so often he plant a stick in the ground, and at the conclusion, there was a straight line of sticks running diagonally across the garden. A builder then excavated the area traced out by the sticks, and found a buried water pipe matching the direction of the track and followed it back until he found the termination. I was obviously impressed. The guy charged my boss £25 for the job, and he was delighted. When I first posted this on here quite a few years ago now, there was much sceptical comment, most of which I had to agree with. Is this proof of special powers? Perhaps not, but whatever the cause of the result, the guy got paid, and my boss was quite happy to pay it.
 
I posted this before on here on a previous dowsing thread, but first of all, I have to say that like the tests have proven, claims of special powers under controlled conditions, have alwaysbeen negative.

My boss back in 1983, commissioned a local dowser to find a water pipe in his front garden. I watched the process from the start as I was living in an apartment overlooking the garden. The task was to find where the pipe terminal was located. The dowser although he lived in the area, did not know this property personally. He used the coat hanger technique, and rather like an archaeologist using magnetic resonance devices, walked and tracked a route backwards and forwards progressively across the garden area. Every so often he plant a stick in the ground, and at the conclusion, there was a straight line of sticks running diagonally across the garden. A builder then excavated the area traced out by the sticks, and found a buried water pipe matching the direction of the track and followed it back until he found the termination. I was obviously impressed. The guy charged my boss £25 for the job, and he was delighted. When I first posted this on here quite a few years ago now, there was much sceptical comment, most of which I had to agree with. Is this proof of special powers? Perhaps not, but whatever the cause of the result, the guy got paid, and my boss was quite happy to pay it.


He probably looked at the planning records for the area.
 
The people who lay pipes don't choose their routes at random, there are reasons why they lay them where they do. There may also be clues in the ground which a dowser can pick up on, not necessarily consciously.

In a properly conducted blind test, no dowser has ever done better than chance. Until one does, there's no need to look for an explanation of occasional successes other than intelligent guesswork and luck.
 
I'm with Pixel42, probably wasn't even necessary to look up any records. I can tell you exactly where my water pipes are because I know where the meter is and I know where they come into the house. I can also tell you where and how deep the sewer is. No coat hangers needed.
 
I thought that perhaps there were subtle clues in the vegetation that showed where the soil had been disturbed, perhaps more compressed.
 
Why'd he even answer the question, who cares? The show was always more entertainment than some sort of documentary, what would explode if they did a bit on dowsing. Would have been out of character if for the show if you ask me.
This. The myths were 'write-ins' that the Mythbusters team had to test by trying it themselves with their own equipment, not by the person making the claim. And the 'myths' always involved some effect that was scientifically 'plausible', at least on the surface. I don't remember them testing any 'myth' that involved psychic powers or nonscientific principles - which makes sense because to make the show interesting they wanted things that had a non-zero chance of being confirmed.

One epside I remember well was when they tested the saying 'going down like a lead balloon', which Adam Savage says was a really important myth for him. The idea was to see whether a balloon made of lead could in fact float, if it was made light enough. This is theoretically possible but very difficult to achieve in practice - and they did it! The trick was to make it large enough to be able to use lead sheet of a practical thickness. They did the calculations and figured it would have to be severel meters in diameter, and would require using the thinnest lead foil available anywhere in the world.

Their goal generally wasn't to debunk a myth, but to give it every possible chance of success. How would this be applied to dowsing? "We found water 5 out of 10 ten times, but statistics say that's no better than chance."? IMO it would make for a pretty boring episide - unless they could find an excuse to shoot a high-powered rifle or blow something up.
 
The comments re my witnessing a dowsing scenario are largely the same as they were when I posted this on here a few years ago. They were about pre-knowledge of the water pipe track from existing records, which of course my boss could have looked up for himself prior to commissioning a dowser, so I don't think that is a very convincing explanation. I watched the guy do the job and he didn't for example have any notes in his hand at the time, or looking down at anything apart from the crossing of the coat hangers, then stopping to plant the sticks in the ground. It didn't actually take very long, it must have been around 10 to 15 minutes. There is no "proof" available either way, so personally it has to be recorded as "interesting", but no more than that, but I thought I would post it again to see if any new alternatives cropped up.
 
The comments re my witnessing a dowsing scenario are largely the same as they were when I posted this on here a few years ago. They were about pre-knowledge of the water pipe track from existing records, which of course my boss could have looked up for himself prior to commissioning a dowser, so I don't think that is a very convincing explanation.
That isn't the only explanation that has been suggested this time, and I very much doubt it was the only one offered the last time you posted it either. I'd also be surprised if the ideomotor effect, and how it can be influenced by the fact that the subconscious mind picks up and processes much more information than is ever brought to the attention of the conscious mind, wasn't mentioned.
I watched the guy do the job and he didn't for example have any notes in his hand at the time, or looking down at anything apart from the crossing of the coat hangers, then stopping to plant the sticks in the ground. It didn't actually take very long, it must have been around 10 to 15 minutes. There is no "proof" available either way, so personally it has to be recorded as "interesting", but no more than that, but I thought I would post it again to see if any new alternatives cropped up.
There's no need for new alternatives when the old ones are perfectly adequate. The only thing that would make your anecdote interesting would be if the dowser in question had at any time taken and passed a blind test.
 
I don't remember them testing any 'myth' that involved psychic powers or nonscientific principles - which makes sense because to make the show interesting they wanted things that had a non-zero chance of being confirmed.
They once tested if plants would grow better if you loved them or hated them, but gave them the exact same treatment. The plants didn’t care.
 
That isn't the only explanation that has been suggested this time, and I very much doubt it was the only one offered the last time you posted it either. I'd also be surprised if the ideomotor effect, and how it can be influenced by the fact that the subconscious mind picks up and processes much more information than is ever brought to the attention of the conscious mind, wasn't mentioned.

There's no need for new alternatives when the old ones are perfectly adequate. The only thing that would make your anecdote interesting would be if the dowser in question had at any time taken and passed a blind test.
Well I have to disagree that the old ones (you didn't say which) are adequate, when they are not, as they can always have caveats attached to them, like the one I suggested for pre-knowledge. The right answer is there, it's just that it is elusive, and so, as I indicated we have to leave it there. My own view for the record and for what it's worth, is that it was a lucky guess as to the tracking of the pipe. I would add, that I didn't see the size of the excavations and how close to the stick line they were where they found the pipe itself, so if the trench had been quite wide, that could help with the luck element. I find my explanation far more credible and convincing than the pre-knowledge, or any ideometer explanation.
 
Well I have to disagree that the old ones (you didn't say which) are adequate, when they are not, as they can always have caveats attached to them, like the one I suggested for pre-knowledge. The right answer is there, it's just that it is elusive, and so, as I indicated we have to leave it there. My own view for the record and for what it's worth, is that it was a lucky guess as to the tracking of the pipe. I would add, that I didn't see the size of the excavations and how close to the stick line they were where they found the pipe itself, so if the trench had been quite wide, that could help with the luck element. I find my explanation far more credible and convincing than the pre-knowledge, or any ideometer explanation.
So what caused the dowsing device to twitch/move? It can't have been electromagnetic or gravity (we know how to test for these and how indeed to use them to find stuff underground) the only forces that can interact with the device are from the person holding the device, so if it isn't "ideometric" then it has to be a "conscious" decision of the dowser to use force to move the device. Do you hold that dowsers are knowingly moving their device?
 
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