SCIENCE IN THE NEWS DAILY
Helpful Bacteria May Hide in Appendix
from the New York Times (Registration Required)
Everyone is born with one, but no one knows what it's for. The human appendix is a small dead-end tube connected to the cecum, or ascending colon, one section of the large intestine. Everyone lives happily with it until it becomes painfully inflamed, when the only treatment is to remove it surgically. Then everyone lives happily without it. So why is it there in the first place?
Some experts have guessed that it is a vestige of the evolutionary development of some other organ, but there is little evidence for an appendix in our evolutionary ancestors. Few mammals have any appendix at all, and the appendices of those that do bears little resemblance to the human one.
Last December, researchers published a novel explanation in The Journal of Theoretical Biology. The appendix, they suggest, is a "safe house" for commensal bacteria, the symbiotic germs that aid digestion and help protect against disease-causing germs.
Read more ...
Connect With Us:
VIDEO: How Hair Ice Grows
In 2013, American Scientist featured an article on odd ice formations on plant stems, including these curling ribbons of ice. One of the types of ice discussed in the article was hair ice—long, thin strands of ice that grow under quite specific conditions. The only problem is that a new study shows the theory put forth at the time—that gas pressure pushes the water out—isn’t correct... (click the link above to read more).
To view all multimedia content, click "Latest Multimedia."
Receive notification when new content is posted from the entire website, or choose from the customized feeds available.