The Skeptical Teacher

Musings of a science teacher & skeptic in an age of woo.

Posts Tagged ‘pressure’

Skeptical Teacher Interviewed on The Pink Atheist

Posted by mattusmaximus on October 17, 2013

This past Sunday evening, I was interviewed on The Pink Atheist podcast/radio show.  The topics of discussion were the vaccine survey research I was involved with and the importance of promoting a good pro-vaccine message, as well as talking about some of the physics behind various crazy demonstrations I perform both in and out of the classroom.

Click the link below for the full audio of my interview, which starts at the 20:25 mark.  Enjoy! :)

The Pink Atheist

pink atheist

Posted in skeptical community | Tagged: , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , | 1 Comment »

Walking Barefoot on Broken Glass – Not Paranormal, Just Physics

Posted by mattusmaximus on March 14, 2010

While at Skepchicamp 2010, one of the woo-busting physics demonstrations I performed was that of walking barefoot on broken glass shards.  Here’s a close up of the action…

This is a standard carnival trick, also used by various New Age gurus to display their supposed mystical, paranormal, or supernatural powers to their gullible followers.  Sorry folks, no woo is required to explain this (pardon the pun) impressive feat.  This is some video shot by a few of my students earlier this year when we were discussing the physics of pressure

It can all be explained with a simple understanding of basic physics: by walking flat-footed on the shards, I spread my body weight evenly over the entire surface area of my feet, which means that I’m touching a large number of glass shards at once. Thus, since my weight is distributed over so many points, the pressure (force per unit area) at any one of those points is so small that it isn’t enough to stab or cut through my skin.

Thus, through a simple application of Occam’s Razor, we can conclude that nothing paranormal is required to explain what’s going on, just good physics!

Posted in physics denial/woo | Tagged: , , , , , , , , , , , , , | 5 Comments »

The Physics of the Bed of Nails: No Woo Required

Posted by mattusmaximus on July 22, 2009

When I was at The Amazing Meeting 7 in Las Vegas recently, I participated in the first TAM Talent Show.  My skit focused upon a favorite physics demonstration and gave me an excellent opportunity to teach some skepticism: the Bed of Nails. Having performed this demonstration about 40-50 times throughout my teaching career, I decided it was time to take things to the big stage :)

The demonstration is simple, and dangerousIT SHOULD NOT BE ATTEMPTED WITHOUT PROPER SUPERVISION!!! In it, I lay down upon a bed of nails, have a second bed of nails placed atop my stomach & chest, have a concrete cinder block placed atop that, and – last but not least – have an assistant break the block with a 10-lb sledgehammer!  Here’s some slow motion footage of the demo at the TAM Talent Show…

Moments later, I got up off the bed of nails with no damage at all – pretty impressive stuff!  Here’s a photo of my chest seconds after the demo…

post-bed-of-nails-smash

The bed of nails has a history of woo – there are some in the martial arts community who claim that their chi or “life force” protects them from injury.  Others, such as gurus in India, claim that the only reason they are uninjured is because of the specific type of meditation they perform.  But a simple application of Occam’s Razor is all that is necessary to explain what’s going on here – and it doesn’t have anything to do with chi, mysticism, or anything supernatural.

Read the rest of this entry »

Posted in ghosts & paranormal, physics denial/woo | Tagged: , , , , , , , , , , , , , , , , , , , , , , | 8 Comments »

 
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