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42 votes

Is vodka (or alcohol solutions with less than 60% concentration) an effective hand sanitizer against Covid-19?

A more recent study (also published by the CDC) seems to indicate that 30% might be a good enough concentration against SARS-CoV-2: [Figure legend:] Effect of commercially available alcohols in ...
against very long user names's user avatar
20 votes
Accepted

Do pathogens have a negative ORP and beneficial bacteria a positive?

The beneficial strain of E. coli K-12 has a negative ORP. Therefore, the original claim cannot be universally true. Furthermore, E. coli is a facultative anaerobe, which means it can survive in both ...
called2voyage's user avatar
13 votes
Accepted

Are antibacterial soaps better than plain soap and water?

This 2015 study, Bactericidal effects of triclosan in soap both in vitro and in vivo, suggests the most popular active ingredient, triclosan, had no effect for exposures commensurate with hand-...
Илья Смирнов's user avatar
12 votes

Do Ultra-violet LEDs on air hand dryers help to kill bacteria?

In 2005, a study was done comparing a number of hand drying methods: Yamamoto Y, Ugai K, Takahashi Y. Efficiency of hand drying for removing bacteria from washed hands: comparison of paper towel ...
Oddthinking's user avatar
  • 143k
11 votes

Do pathogens have a negative ORP and beneficial bacteria a positive?

Pathogens create a waste material that is poisonous to the body. The more common definition of pathogen is that it does harm to its host - see abstract of this interesting looking paper "What is a ...
Tom Goodfellow's user avatar
10 votes
Accepted

Did Louis Pasteur admit on his deathbed "Bernard [the inventor of terrain theory] was right"?

This can be traced to a questionable 1922 anecdote. Okay, I have an answer now. The original French quotation, "le terrain est tout, le microbe n’est rien," was in vogue among doctors in the ...
Avery's user avatar
  • 46.3k
9 votes
Accepted

Does the risk of becoming infected with COVID-19 decrease by washing hands?

Direct evidence of actual viral disease transmission via fomites (the medical term for inanimate surfaces) is unfortunately notoriously difficult to produce, according to a 2007 review: direct ...
against very long user names's user avatar
9 votes
Accepted

Was Ignaz Semmelweis ignored by the medical community when he advocated hand washing?

1) Was Ignaz Phillip Semmelweis the first to identify or a pioneer in identifying, the importance of hygiene in these cases? A. Ignaz Semmelweis was not the first to emphasize the significance of ...
pericles316's user avatar
  • 22.8k
8 votes
Accepted

Are 40% of the oceans' bacteria killed by viruses every day?

According to Bacteriophage Distributions and Temporal Variability in the Ocean’s Interior mBio Nov/Dec 2017 Volume 8, e01903-17: Phages have been shown to kill hosts at rates of up to 20 to 40% of ...
DavePhD's user avatar
  • 107k
8 votes

If I buy "flushable" wipes, can I flush them without problems?

This website from ThamesWater (a water management company in UK) states that they are not flushable, and even shows you why. Other sources tell the same story: https://www.lanesfordrains.co.uk/...
algiogia's user avatar
  • 355
8 votes
Accepted

Is brushing your teeth after vomiting dangerous for your teeth?

If brushing your teeth with traces of acid in your mouth really is dangerous, shouldn't we hear about it without mentioning of vomit? Yes, and we do (from Colgate): You should know, however, ...
Brythan's user avatar
  • 10.2k
7 votes

Does boiling water with solid silver kill germs?

This World Health Orgainization report explores silver as a water disinfectant. It kills a wide variety of bacteria, and fungi without leaving a residue or many chemicals in the water. Silver has ...
BobTheAverage's user avatar
6 votes
Accepted

Does washing salad remove E-coli?

Indeed you're wrong. A study reported that washing lettuce leaves with tap water for 15 s provided a log reduction of 1.16 (93.08 %) of the E. coli population, while "prolonging washing time with ...
Skippy le Grand Gourou's user avatar
6 votes

Do hand dryers in public bathrooms spread bacteria?

According to a recent research paper, "Evaluation of the potential for virus dispersal during hand drying: a comparison of three methods", jet air dryers are the "worst", while warm air dryers are ...
Sparkler's user avatar
  • 485
4 votes

Home-made vs. commercial toothpaste?

Commercial toothpastes contain fluoride. Home-made ones don't. Fluoride effect on cavity reduction is well-established. For example: https://www.ncbi.nlm.nih.gov/m/pubmed/16208382/ As such, your ...
Jeffrey's user avatar
  • 140
4 votes

Do hand dryers in public bathrooms spread bacteria?

This paper found that air-blower hand driers were much worse than paper towels. The Dyson Airblade is a particularly bad offender. Update: now it turns out that air-blower hand driers also suck in ...
Paul Johnson's user avatar
  • 16.6k
3 votes

If I buy "flushable" wipes, can I flush them without problems?

In the UK it depends on the product The UK Water Industry (WI) has set specification WIS 4-02-06 (set in 2019) for toilet wet wipes which are fine to flush. Any wet wipes certified fine to flush have ...
Chris Rogers's user avatar
  • 2,638
2 votes

Is this study evidence that a fly falling into one's drink should be dipped?

The 1990 paper by Baeshin is dipping flies for 20 seconds (vs floating fly for 20 seconds) and dipping flies thrice for 20 seconds each (vs floating for 60 seconds) in some experiments using the same ...
bukwyrm's user avatar
  • 1,676
2 votes

Does gaunyle, derived from cow urine, work as a disinfectant?

"Gaunyle" is advertised as "organic phenyle" and "organic phenyl" and as a general disinfectant for floors - thus i believe the idea is that is an 'organic' alternative ...
bukwyrm's user avatar
  • 1,676
1 vote

Does the risk of becoming infected with COVID-19 decrease by washing hands?

COVID-19 is, in this respect, no different than any of a million other pathogens - and hand-washing isn't a new thing. The Global Handwashing Partnership has been working for years on promoting hand ...
jdunlop's user avatar
  • 2,948
1 vote
Accepted

Is washing hands with soap necessary when backpacking?

It is definitely worth bringing sanitizer on a hike Germ Longevity Bacteria and viruses die after a while on your skin - anywhere from hours to months according to the UK NHS. If you can keep your ...
Dale M's user avatar
  • 1,365

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