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Break Step Bridge (Episode)

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Break Step Bridge/Toothbrush Surprise/Rowing Water Skier
Mythbusterss Episode A-15
Breakstep bridge

The bridge[1]

IMDB Ref tt0768457
Season 1
Episode 15
Airdate 15 January 2004
Previous Episode Transmitted Sinking Titanic
Next Episode Transmitted Buried in Concrete


Episode CastEdit

[2]


The MythsEdit

Breakstep Bridge Edit

Myth statement Status Notes
Soldiers marching in unison can cause harmonic oscillation in a bridge and cause it to collapse. (see Broughton Suspension Bridge) Busted Adam built a 60ft (18m) by 6ft (1.8m) suspension bridge from metal tubing and nylon rope, while Jamie built 12 dummy soldiers out of air-powered actuators and combat boots. In the initial test, the soldiers moved far too slowly due to a disconnected hose. During the second and third tests, the soldiers stomped too hard on the bridge, causing the bridge to collapse from impact without any harmonic vibration.

The myth was retested for Myths Revisited and found plausible. It was ultimately cut out of the episode, but later included in MythBusters Outtakes.[3]

Rowing Water Skier Edit

Myth statement Status Notes
A rowing eight can pull a water skier at sufficient speed for them to stay upright. Confirmed After several tries, Jamie was able to stay upright for over 40 seconds, with only a few hours experience in waterskiing.

Toothbrush Surprise Edit

Myth statement Status Notes
Fecal coliform bacteria can travel from a toilet to a toothbrush and grow in its bristles. Confirmed After confirming that a toilet flush does put out an aerosol spray, Adam builds a rack to hold 44 toothbrushes at various distances from the toilet in the shop, as well as two controls kept in the office. Each day, Adam and Jamie exposed the brushes to toothpaste and rinsed with distilled water, with brushing with a pair kept right above the toilet bowl. Fecal coliforms were indeed found on all the test brushes, including the control ones, but none at a level high enough to be dangerous. A microbiologist from UCSF confirmed that such coliforms were impossible to completely avoid, and that there was no significant difference in the number of bacteria based on where the toothbrushes were placed in respect to the toilet bowl.

ReferencesEdit

  1. Follw It
  2. IMDB Entry tt0768457
  3. Break-Step Bridge clip cut from Myths Revisited

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