Flowing Salt Water Over Graphene Generates Electricity

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“Hydroelectricity is one of the oldest techniques for generating electrical power, with over 150 countries using it as a source for renewable energy. Hydroelectric generators only work efficiently at large scales, though—scales large enough to interrupt river flow and possibly harm local ecosystems. And getting this sort of generation down to where it can power small devices isn’t realistic. In recent years, scientists have investigated generating electrical power using nano-structures. In particular, they have looked at generating electricity when ionic fluids—a liquid with charged ions in it—are pushed through a system with a pressure gradient. However, the ability to harvest the generated electricity has been limited because it requires a pressure gradient to drive ionic fluid through a small tube. But scientists have now found that dragging small droplets of salt water on strips of graphene generates electricity without the need for pressure gradients.” w/ photos

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How Coughs & Sneezes Float Much Farther Than You Think

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“When you cough or sneeze, you see the droplets, or feel them if someone sneezes on you,’ says John Bush, a professor of applied mathematics at MIT, and co-author of a new paper on the subject. “But you don’t see the cloud, the invisible gas phase. The influence of this gas cloud is to extend the range of the individual droplets, particularly the small ones.’ Indeed, the study finds, the smaller droplets that emerge in a cough or sneeze may travel five to 200 times further than they would if those droplets simply moved as groups of unconnected particles — which is what previous estimates had assumed.” w/ photos

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Sustainable Buildings Or Unsustainable Climate Change?

“Today’s existing buildings use 72% of our nation’s electricity, much of which is wasted. We cannot transform our energy system and prevent runaway climate change if America’s commercial buildings continue to consume dirty fossil fuels at today’s rates.” — Rocky Mountain Institute

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The Human Cost Of Electronics

“This short documentary reveals the hazards of the electronics industry in China profiling workers poisoned by chemicals and their struggle for compensation. Thousands of young people in China enter export factories to make the West’s favorite electronic gadgets, only to find they have contracted occupational diseases or worse, leukemia, by the age of 25.” — Who Pays Film

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Why Do We Get Allergies?

“Spring is finally here! The sun is shining, the birds are chirping, the flowers are blooming causing sneezing, sniffling, and hives. What causes us to have allergies? Tara investigates why we have allergies, and discusses some ways that might be able to provide you with some relief.” — Dnews

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What Are Armpits For?

“Greg Foot answers a question from Kevin Sheppard on our Head Squeezers Google+ community. What are armpits for, and why are they hairy? Interested in how the smell of your sweat could help you score? Watch away…” — Head Squeeze

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Why The Yankees Triumphed During Prohibition

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“One of the best beer-and-baseball stories, though, comes from the dry years of Prohibition, 1920-1933, when the New York Yankees made it to seven World Series and won four. Their rise began in 1915, when the team was purchased for $1.25 million. The new owners were Tillinghast Huston—a civil engineer, who served in the Spanish-American War and World War I and left with the rank of Lt. Colonel—and Jacob Ruppert, Jr.—a wealthy New York City brewer, who served a couple of terms in Congress and enjoyed being addressed by his honorary title, also Colonel. The Yankees had never won a pennant until the Colonels, as they were known, got a hold of them. Their masterstroke was to add a Boston Red Sox pitcher to the roster in 1920. That player’s name was Babe Ruth.” w/ photos

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How Do Insects Fly?

“HeadSqueezer Leon Vanstone explains the incredible process that allows insects to fly and how they shape up to aeroplane and helicopter flight.” — Head Squeeze

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Who Invented The Internet? And Why?

“Who was the genius who came up with all of that? The internet is such a crucial tool in our daily lives today that we hardly remember that it hasn’t been here forever. But yeah, it is actually not that old. We still have fuzzy memories about the time before the first thing in the morning was to check email and browse our favorite blogs and youtube channels. Well, let’s explore how the internet came into existence and why.” — Kurzgesagt

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