Sounds reasonable.
The controversial idea that space impacts may have wiped out woolly mammoths and early human settlers in North America has received new impetus.
Nano-diamonds and other exotic impact materials have been unearthed in thin sediments, Science magazine reports.
The age of these materials coincides with the start of a millennium-long climate cooling event known as the Younger Dryas - some 13,000 years ago.
Many large animals vanish from the archaeological record at this time.
It is also the period in Earth history that sees the demise of Clovis culture - the prehistoric civilisation that many regard as the first human occupation of North America.
Taken together, it all makes for a compelling story, claims the team behind the latest research.more
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