Uncategorized
- Earth
No-drive experiment curbs air pollution in Beijing
Traffic-control measures can significantly reduce urban air pollution, a field study in Beijing this past summer indicates.
- Humans
An earlier thaw can trim winter logging
In New Hampshire, the trend toward earlier spring thaws has significantly lowered logging revenues.
- Paleontology
Struck from above
Evidence of an extraterrestrial object striking Earth at the height of the last ice age comes from micrometeorites embedded in the tusks of creatures that were grazing the Alaskan tundra when the object burst in the air above.
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19914
Your article suggested yet a second possibility leading to the decline or extinction of the mammoths in the region of the apparent iron micrometeorite-shower impact, which drove the metallic particles into the sides of the fossil tusks examined.
