Paper Towel vs Hand Dryers

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Dec 022014
 

Which is better, paper towels or hand dryers? Asap Science explains that paper towels have the upper hand for cleaning bacteria off our hands. But dryers may be better for the environment. So the choice depends on whether you are a cleanly Conservative or a dirty Hippy Liberal. I’m just saying!

There’s a lot of debate about which method of drying your hands is actually the most clean. This video explores the benefits of both and explains which one actually helps keep your hands the most clean.

Around 80% of infectious diseases are spread with our hands—so washing regularly with soap and water is very important—but does the way you dry hands matter? YouTube channel AsapSCIENCE compares paper towel drying with hand dryers to see the effects of both. It turns out that paper towels are a little more effective for two reasons: timing and friction. Using paper towels can be wasteful, though, so if you plan to use them, keep this trick in mind for maximum efficiency.

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Paper Towel vs Hand Dryers

 

How To Of The Day: How To Cut Rope In An Emergency

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Nov 232014
 

Here is a great trick that shows you how to cut a string or rope if you haven’t got a knife or a pair of scissors.

Enjoy!

Rope and string is always good to have on hand for an emergency. But what if you have to cut the string or rope shorter, but have no knife or scissors. Well there is nothing to worry about. Life hacker Dave Hax has come forward with this quick trick to cut a rope shorter by using… more rope! Ingenious!

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How To Cut Rope In An Emergency

 

What Happens After You Flush?

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Nov 192014
 

Hank Green of Sci Show explains everything that happens when you flush the toilet in this extended educational video.

Humans have always peed and pooped, but where it goes after we’ve done our business has changed a lot. In fact: The water you just drank may well have been a part of someone’s urine just weeks ago! SciShow explains!

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What Does Sound Look Like?

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Nov 102014
 

You can actually see sound waves as they travel through the air thanks to a clever photographic trick called Schlieren flow visualization.

Schlieren flow visualization is based on the deflection of light by a refractive index gradient The index gradient is directly related to flow density gradient. The deflected light is compared to undeflected light at a viewing screen. The undisturbed light is partially blocked by a knife edge. The light that is deflected toward or away from the knife edge produces a shadow pattern depending upon whether it was previously blocked or unblocked. This shadow pattern is a light-intensity representation of the expansions (low density regions) and compressions (high density regions) which characterize the flow.

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