Web edition: July 23, 2007
Print edition: July 28, 2007; Vol.172 #4 (p. 63)
Doesn't "Spinning into Control" (SN: 05/19/07, p. 312) on flywheels leave out a significant aspect: the gyroscope effects of a rotating large mass? Wouldn't it be a benefit for moving installations (stabilization) and a problem for immobile installations?
Palo Alto, Calif.
In the article, the flywheels depicted appear to have vertical axles. I presume that this prevents inertial forces from being a problem when a vehicle using one of these systems changes direction. It would seem that such forces could be a real problem for a vehicle with a flywheel installed horizontally when it attempted to turn.
Perry F. Crabill Jr.
In view of the extreme importance of atmospheric carbon dioxide, I would have expected the momentous conclusion that southern oceans aren't absorbing the expected increased amount of CO2, as well as the assertion that nutrient-enriched water absorbs CO2 less effectively than leaner water does, to be confirmed by field observations. As presented, "Biological Hot Spots: Ocean eddies may not always lock away carbon" (SN: 5/19/07, p. 307) appears to represent nothing more than speculation.
Fredric M. Blum
As I read "When female chimps become baby killers" (SN: 5/26/07, p. 333), I wondered if the sex of the killed infant was determined. In a troop characterized as having a disproportionate number of females, could it be that the chimps are selectively killing females in an attempt to balance sexes in the group?
"Migraines in men linked to heart attack risks" (SN: 5/26/07, p. 333) states that although men who suffer from migraines are more likely to experience heart attacks, scientists have failed to find a biological mechanism linking them. Such a link seems to be suggested in an earlier Science News article, "A Gasping Heart" (SN: 4/7/07, p. 218), which states that a patent foramen ovale is linked to migraines and that that heart defect, combined with sleep apnea, can cause oxygen desaturation, which can be a factor in cardiovascular disease.
William A. Stephens
Harder, B. 2007. A gasping heart. Science News 171(April 7):218-219. Available at [Go to].