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What would you think of powering a car using a water fuel cell, a home furnace powered by permanent magnets, or a self-driven electromagnetic engine with enough power to put a spacecraft into orbit? This is all energy that humans wouldn't have to pay for and that wouldn't pollute the earth. Not only would free energy change the world, but it would end human dependence on having to use so much of the world's fossil fuels.
(Source: DCMP)
Earth's moon was probably formed when a body the size of Mars collided twice with the planet. The moon is steadily receding into space; eventually, due to the loss of this lunar regulator, Earth will start to wobble, creating climatic chaos. Eclipses can be also seen often when the sun obscures the moon or vice versa. Another light show, the Aurora, occurs when electrified particles from the solar wind interact with Earth's upper atmosphere and is visible particularly in the Polar Regions.
In 1898, two African lions began attacking railway workers in Tsavo, Kenya. First reports estimated that 135 people fell victim to these "man-eaters," but further research published in 2009 lessened that number to 35 individuals. Over the years, different theories as to what motivated these attacks have varied, and recently host Emily Graslie got to talk with two experts who are working towards finding an answer. Part of "The Brain Scoop" series.
In 1928, a physician named Alexander Fleming observed that a mold in one of his Petri dishes was killing the bacteria he was trying to grow. This strain of mold led to one of the most significant medical discoveries in history: the antibiotic penicillin. Antibiotics soon became lifesavers. However, even back then, Fleming knew that bacteria could become resistant to penicillin. This video describes how widespread use of antibiotics in medicine, agriculture, and household products can lead to the evolution of microbes that are resistant to multiple antibiotics. Part of the "I Contain Multitudes" series.
Global warming is accelerating the melting of the world’s glaciers. The rate of glacial retreat has increased over the last hundred years due to global warming and the increase of greenhouse gas emissions. The increase in glaciers melting has significant impact on the water supply for many global communities. Glacial retreat also impacts world climate zones since glaciers help regulate the climate of the planet. However, scientists argue that it is not too late to reverse the effects of global warming in an effort to decrease the rate at which glaciers are melting. Chapter 11 of Air: Climate Change Series.
How can honeybees communicate the locations of new food sources? Austrian biologist, Karl Von Frisch, devised an experiment to find out. By pairing the direction of the sun with the flow of gravity, honeybees are able to explain the distant locations of food by dancing. The scientists at Georgia Tech University explain the design of Von Frisch's famous experiment and describe the precise grammar of the honeybees dance language with new computer vision techniques. They hope the research into behaviors of social insects will aid in the design of better systems of autonomous robots.
As shown on the History Channel. We are so familiar with the map of United States, but do we know why our states look the way they do? Every shape on the map tells a story about our past. Why is California bent? To cling on to gold. Why does Oklahoma have a panhandle? Because of shifting borders for slavery. Why does Missouri have a boot? Because of a massive earthquake. Examines how every state is a puzzle piece revealing the unique geography, political, and social history of America.
Vickie Gutierrez began working at NASA in 2002, but her first step toward her career began as she watched Neil Armstrong take his first step on the moon. Gutierrez's interest continued to grow as she experienced her own thrill of a countdown and launch of a rocket she built for a fifth grade class demonstration. After taking a career assessment test in middle school, Gutierrez found that aerospace engineering was among her top choices. It was then that she began to put a name to her future; she wanted to work at NASA. Part of the "Women@NASA" series.
Since the time of the ancient Greeks, humans have been using spider silk to dress wounds. Scientists now know spider webs not only have healing qualities, they can be stronger than steel. University of Wyoming Molecular Biologist Randy Lewis adds an almost science fiction aspect to the study of spider silk: making large quantities of it by “growing it” in goat’s milk. With funding from the National Science Foundation, Lewis has cloned and sequenced genes for the proteins that make up five different spider silks, some stronger than Kevlar, others more elastic than nylon.
The first thing a baby giraffe experiences after being born is a two-meter fall straight down to the ground. But within an hour, it’s standing, walking, and nursing on its own. A blue whale calf, after nearly a year growing inside mom, can swim to the surface moments after being born. Human babies on the other hand are born unable to move or eat on their own. If humans are so smart, why are human babies so unsmart? Some may think it’s all about head size, but the real science is more complex. Part of the “It’s Okay to Be Smart” series.
At Virginia Polytechnic Institute and State University, Christopher Williams heads the effort to further advance 3-D printing with copper, a widely used conductor in electronics. Williams is using a process called binder jetting in which an inkjet printer selectively jets glue into a bed of copper powder, layer-by-layer. The printed copper product is then taken to a furnace to fuse the particles together. With support from the National Science Foundation, Williams is addressing a major challenge in the 3-D copper printing process, which is to eliminate the porosity that develops in the part during the process. Part of the National Science Foundation Series “Science Nation.”
The arctic ground squirrel has developed highly specialized adaptations to extreme environments. This species maintains circadian rhythms throughout the arctic summer, despite the almost ceaseless daylight during this period. The squirrels’ body clocks have evolved to work just fine without the help of the day/night cycle. With support from the National Science Foundation, physiological ecologist Cory Williams of the University of Alaska, Anchorage, and a team of researchers traveled to the Toolik Field Station in northern Alaska to study the arctic ground squirrel on its home turf. Part of the National Science Foundation Series “Science Nation.”
Tony Ro, a neuroscientist at The City College of New York, is artificially recreating a condition called blindsight in his lab. Blindsight is a condition that some patients experience after having damage to the primary visual cortex in the back of their brains. What happens in these patients is they go cortically blind, yet they can still discriminate visual information. With support from the National Science Foundation, Ro is developing a clearer picture of how other parts of the brain, besides the visual cortex, respond to visual stimuli. He says understanding and mapping those alternative pathways might be the key to new rehabilitative therapies.
In Miki, Japan, a six-story wooden model condominium was shaken by the equivalent of a 7.5 magnitude earthquake. The test was said to be the largest simulated earthquake ever attempted with a wooden structure. The full-scale building sat on a metal shake table that rocked it violently back and forth. The table, designed to hold up to 2.5 million pounds, reproduced forces based on those recorded during the 1994 earthquake in Northridge, California. But, it was scaled up by 180 percent to simulate an earthquake so violent it would only occur an average of once every 2,500 years. Part of the "Science Nation" series.
In the dark recesses of a warehouse, a drunken game of cards explodes into a murder. Now the night watchman lays dead. The only witnesses are a housefly or perhaps a cockroach that might be skittering by. That stylized tribute to our seemingly endless appetite for TV programs about forensic science sets the stage for an examination of how, in the real world of police investigations, nature is being enlisted in the war on crime. Sifts through the mayhem, murder, and science that make up the world of forensic investigation with the help of Dr. Jennifer Gardy, of British Columbia's Centre for Disease Control (CDC).
At first, the back room of plant physiologist Edgar Spalding's lab at the University of Wisconsin-Madison might be mistaken for an alien space ship set straight out of a Hollywood movie. It's a room bathed in low-red light with camera lenses pointing at strange looking entities encased in Petri dishes. A closer inspection reveals the Petri dishes contain nothing alien at all, but rather very down-to-earth corn seedlings. They're grown in red light for optimal growth. They're just one of the plants featured in thousands of time-lapse movies Spalding has created over the past five years. The goal is to figure out how to grow crops optimally.
With support from the National Science Foundation, Liangfang Zhang and his team at UC-San Diego have created a nanosponge to combat drug-resistant infections, such as those caused by Methicillin-resistant Staphylococcus aureus (MRSA). The nanosponge, made from biocompatible, biodegradable polymer nanoparticles, is camouflaged with a red blood cell membrane. It circulates in the bloodstream, absorbing the toxins produced by infection. Once the nanosponges are fully loaded with toxins, they are safely disposed of by the liver. They are designed to work with any type of infection or poison that attacks the cellular membrane. Part of the National Science Foundation Series “Science Nation.”
There isn't an easy answer to the question: What is the nearest galaxy to the Milky Way? The Andromeda Galaxy is the closest complete galaxy; however, astronomers have found several dwarf galaxies orbiting the Milky Way. Part of the "Ask an Astronomer" series.
Showing collections 1 to 7 of 7
Biology related concepts
A collection containing 59 resources, curated by Benetech
A collection of Chemistry related resources
A collection containing 67 resources, curated by Benetech
Resources to teach younger students about animals
A collection containing 58 resources, curated by DIAGRAM Center
3D models and images of the entire periodic table of elements
A collection containing 118 resources, curated by Library Lyna
Collection of anatomy resources
A collection containing 21 resources, curated by Benetech
A collection of simulations from PhET.
A collection containing 15 resources, curated by Charles LaPierre
Resources related to vision
A collection containing 12 resources, curated by Charles LaPierre
