Uncategorized
- Earth
Letters from the July 16, 2005, issue of Science News
Muddy, clarified “Muddy Waters” (SN: 5/21/05, p. 328), on the deleterious effect of dams on coastal systems, contains a major conceptual error. It states that “another important cause of the ground sinking is the waning of sediment deposition by the Mississippi River.” But over the past 100 million years, the northern Gulf Coast region has […]
- Physics
Getting Warped
While museum displays such as simulations of warped space-time acquaint visitors with the ideas behind Albert Einstein's scientific discoveries, other galleries of artifacts, letters, and even film footage reveal the multifaceted man that Einstein was.
-
19574
In your article, you describe Einstein’s negative reaction to Newton’s proposition that gravity acts instantaneously on two objects. The notion of simultaneous (if not instantaneous) properties in physics is one of the basic notions of quantum physics. I do not feel that Einstein’s “particle-like” description of light makes him (even “ironically”) “a builder of the […]
- Humans
From the July 13, 1935, issue
An artificial cavern with no echoes, a new theory from Albert Einstein, and an explanation for red shift.
-
Ocean Habitats
These Web pages provide a set of lesson plans devoted to organisms that live in the intertidal zone. Geared to grades seven to nine, the activities include studies of a variety of shells, a virtual tour of a rocky coast, and a study of life in a tide pool. Several online videos accompany the lessons. […]
- Astronomy
Triple Play: A planet with three suns
Three suns grace the skies above a newly found, Jupiterlike extrasolar planet, posing a puzzle for how massive planets form in a closely-knit, multiple-star system.
-
19573
In your article you refer to a standard concept of a person speeding “in a rocket traveling slightly less than the speed of light” and say that “motion at such enormous speeds drastically slows the clock for the traveler.” That reasoning, which is common, troubles me. If the traveler is traveling speedily with respect to […]
- Physics
Realistic Time Machine? New design could forgo exotic ingredient
A novel time machine concept may avoid a problem of earlier, less-practical proposals by requiring only normal matter and the vacuum known to exist in space.
- Earth
Pollution Ups Blood Pressure: Inhaled particles linked to transient effect
In a laboratory setting, volunteers breathing pollutants generated by sources such as vehicle engines experience slight but steady increases in blood pressure.
- Earth
Arctic Foulers: Foraging seabirds carry contaminants home
When seabirds go out looking for food, they can bring home traces of pollutants that build up around their nesting colonies.
- Earth
Power-laden winds sweep North America
There's more than enough wind power to satisfy the United States' energy requirements, a new analysis of weather data suggests.
-
19572
I was very glad to read of the research done by Stefano Pluchino with adult-mouse stem cells. I am, however, terribly disappointed with his comment that therapeutic trials in humans are 4 to 5 years away. As someone with multiple sclerosis and a scientific background, I see no reason why the timetable can’t be moved […]
