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Types of Volcanoes

Geologists describe four types of volcanoes. Cinder cones, the simplest of volcanoes, grow as pieces of congealed lava rise from a central vent and form a funnel-shaped crater. Lava domes arise from lava too viscous to flow far or fast. The dome accumulates atop a central vent and expands from the inside. Shield volcanoes grow as fluid lava spreads ...

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TypesofVolcanoes
Chemistry

Hydrogen Reaction Experiment Reaps a Surprise

Scientists got a surprise recently when a team of physical chemists at Stanford University studied a common hydrogen reaction. Scientists got a surprise recently when a team of physical chemists at ... Continue reading

HydrogenReactionExperiment
Chemistry

Hydrogen - The Simplest Element

Hydrogen is the simplest element; an atom consists of only one proton and one electron. It is also the most plentiful element in the universe. Despite its simplicity and abundance, hydrogen doesn't ... Continue reading

Hydrogen
Biology

Fahrenheit 98.6

When you're well, your body temperature stays very close to 37o C. (98.6o F.), whether you're playing basketball in an overheated gym or sleeping in the stands at an ice hockey game in a snowstorm. ... Continue reading

Fahrenheit986
Chemistry

It's Crying Time Again

If you've ever spent any time in the kitchen, you know that slicing, chopping or dicing raw onions makes you cry. This vegetable has been doing this to humans for a long time. The onion is believed to ... Continue reading

Crying

NASA's First Historic Challenge

NASAsFirstHistoricChallengeIn a time of uncertainty at home and abroad, an American president proposes bold new steps in the exploration of space. He calls for 'longer strides' which 'may hold the key to our future here on Earth.' He touts the potential of 'even more exciting and ambitious exploration of space, perhaps beyond the moon, perhaps to the very end of the solar system itself.' The year is 1961. The president is John F. Kennedy. But the words ring true today, as NASA aims for new frontiers with a new Vision for Space Exploration. Kennedy's 'Special Message to Congress on Urgent National Needs' came on May 25, just three weeks after Mercury astronaut Alan B. Shepard became the first American in space. Delivered at the height of the Cold War with the Soviet Union, the speech is best known for Kennedy's audacious challenge to NASA and America. 'I believe that this nation should commit itself to achieving the goal, before this decade is out, of landing a man on the moon and returning him safely to Earth.'

NASA fulfilled that goal on July 20, 1969, when Apollo 11's lunar module Eagle touched down in the Sea of Tranquility, with Neil Armstrong and Buzz Aldrin aboard. A dozen men would walk on the moon before the Apollo program ended. The last of those men, Gene Cernan, left the desolate lunar surface with these words: 'We leave as we came and, God willing, as we shall return, with peace and hope for all mankind.' Now, NASA is indeed looking to return to the moon, as well as planning new journeys to Mars and beyond. Much has changed in the 43 years since Kennedy's speech. Our Cold War Soviet rivals are now our Russian partners on the International Space Station. And the technological feats Kennedy helped initiate have spawned countless tangible benefits on Earth. Medical technologies, weather forecasting, computer technology and telecommunications can all trace their origins to the space program.

What hasn't changed is the spirit of exploration and discovery. Announcing NASA's new initiative in January 2004, President Bush put it this way: 'Mankind is drawn to the heavens for the same reason we were once drawn into unknown lands and across the open sea. We choose to explore space because doing so improves our lives, and lifts our national spirit.' Chris Cassidy, a member of NASA's 2004 astronaut class, puts the need to explore in more personal terms. 'I hope to be the next guy on the moon.'