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Hassium is a chemical element with the symbol Hs and the atomic number 108. Hassium is highly radioactive; its most stable known isotopes have half-lives of approximately ten seconds.
(Source: Library Lyna)
Roentgenium is a chemical element with the symbol Rg and atomic number 111. It is an extremely radioactive synthetic element that can be created in a laboratory but is not found in nature.
What is frequency? Why is it so important for radio and sound waves? Adabot gets all the answers from Ladyada and a new friend. Part of the "Circuit Playground" series.
(Source: DCMP)
Students investigate the features of vibrations and waves. Examples of these phenomena help students understand how sounds are formed, how light travels, and how ocean waves move. Students also explore different types of waves such as microwaves, radio waves, and seismic waves. Concepts and terminology include vibration, energy, wave, light, and sound.
Promethium is a chemical element with the symbol Pm and atomic number 61. All of its isotopes are radioactive; it is extremely rare, with only about 500–600 grams naturally occurring in Earth's crust at any given time.
Livermorium is a synthetic chemical element with the symbol Lv and has an atomic number of 116. It is an extremely radioactive element that has only been created in the laboratory and has not been observed in nature.
Lawrencium is a synthetic chemical element with the symbol Lr (formerly Lw) and atomic number 103. It is named in honor of Ernest Lawrence, inventor of the cyclotron, a device that was used to discover many artificial radioactive elements.
Dubnium is a synthetic chemical element with the symbol Db and atomic number 105. Dubnium is highly radioactive: the most stable known isotope, dubnium-268, has a half-life of about 28 hours. This greatly limits the extent of research on dubnium.
Bohrium is a synthetic chemical element with the symbol Bh and atomic number 107. It is named after Danish physicist Niels Bohr. As a synthetic element, it can be created in a laboratory but is not found in nature. All known isotopes of bohrium are extremely radioactive.
Sirens are a small part of the sophisticated warning system used for tsunami alerts. Meteorological agencies issue warnings and send alerts to television and radio channels, the Internet, and mobile phone networks. These systems are found throughout the world and are vital for tsunami prone areas like Japan. Part of the "Danger Zone" series.
From a table at a bar, on a corner of the city of Buenos Aires, we discovered the nature of some of the “wave motion phenomenon” that surrounds us. Some of these were radio and TV waves or the ones from the microwave in the kitchen, solar light, X-rays and cosmic waves.
Summer ice retreat in the Chukchi Sea between Alaska and Russia is a significant climate change impact affecting Pacific Walruses. Scientists follow walruses in their summer sea ice habitat and show how United States Geological Survey (USGS) biologists use satellite radio tags to track their movements and behavior. The information identifies areas of special importance to walruses during sparse summer sea ice.
At first glance, the bone-dry landscape of the Atacama Desert in Chile might seem inhospitable. But, it’s prime real estate for astronomers. This desert is now home to the largest ground-based radio telescope in the world called the Atacama Large Millimeter/submillimeter Array or “ALMA for short. And, it’s allowing astronomers to see the universe like never before. Part of the National Science Foundation Series "Science Nation."
Anole lizards are highly territorial and typically stick close to their home tree. So, what happens when a team of researchers carries them far away into the forest? Will they find their way back? Dr. Manuel Leal and colleagues designed an experiment to find out. They displaced the lizards from their home territories and then tracked their movements using radio transmitters. Most of the lizards were able to orient themselves and head in the right direction, with some making a beeline back to their original tree in less than 24 hours.
Space weather can have important consequences for everyday life, such as interference with radio communication, GPS systems, electric power grids, the operation and orientation of satellites, oil and gas drilling, and even air travel as high altitude pilots and astronauts can be subjected to enhanced levels of radiation. The United States Geological Survey (USGS) Geomagnetism Program monitors variations in the Earth's magnetic field through a network of 14 ground-based observatories around the United States and its territories, providing data in real-time to a variety of customers.
It bursts from the sun with the power of ten thousand nuclear weapons... and when it hits our planet, it could create the largest disaster in recorded history. A magnetic storm from the sun could wipe out electrical power, television, radio, military communication, and nearly every piece of electronics in the Northern Hemisphere. Learn about a planet-wide "hurricane" of magnetic forces called "Solar Katrina" that could permanently scramble all 21st Century technology. What causes this magnetic superstorm and why is it so powerful? And is there anything we can do to prevent the Magnetic Storm?
Kathy Blake is blind but two years ago she got a glimmer of hope. She heard about an artificial retina being developed by a company called Second Sight and the Doheny Eye Institute in Los Angeles. It was experimental, but Kathy was the perfect candidate. With funding from the National Science Foundation, a camera is built into a pair of glasses, sending radio signals to a tiny chip in the back of the retina. The chip, small enough to fit on a fingertip, is implanted surgically and stimulates nerves that lead to the vision center of the brain.
Americium is a synthetic radioactive chemical element with the symbol Am and atomic number 95.
Californium is a radioactive chemical element with the symbol Cf and atomic number 98. It is an actinide element.
Neptunium is a chemical element with the symbol Np and atomic number 93. It is a radioactive actinide metal.
Showing collections 1 to 3 of 3
3D models and images of the entire periodic table of elements
A collection containing 118 resources, curated by Library Lyna
Resources related to vision
A collection containing 12 resources, curated by Charles LaPierre
A collection of Chemistry related resources
A collection containing 67 resources, curated by Benetech
