Notebook
- Earth
50 years ago, mysterious glass hinted at Earth’s violent past
Like Hansel and Gretel followed a trail of breadcrumbs, scientists have followed tektites to the sites of major meteorite impacts.
- Earth
50 years ago, scientists thought they had found Earth’s oldest rocks
Even older rocks and minerals continue fueling debates over Earth’s crust, plate tectonics and even when life arose.
- Animals
Some African birds follow nomadic ants to their next meal
Specialized interactions between birds and driver ants in Africa could help explain why the birds are especially sensitive to forest disturbances.
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