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There is a striking similarity in the wave patterns of the ash plume on the cover of the Sept. 13 issue (above) and those in the gas of the Perseus Cluster pictured in this article. Could it be that volcanoes produce sound waves we can’t hear but can see in the plume? Paul HeinsGainesville, Fla. […]
- Astronomy
A Low Note in Cosmos: Sounding out a new role for black holes
Astronomers have for the first time detected sound waves generated by a black hole.
- Health & Medicine
Control of animal epidemic slowed human illness
Control measures implemented in response to the devastating animal epidemic of foot-and-mouth disease can apparently help curtail the spread of the cryptosporidium parasite, which sickens people.
