Scientists are uncovering new clues that a cosmic explosion may have rocked Earth at the end of the last ice age. At major Clovis-era sites, researchers found shocked quartz—evidence of intense heat ...
It started in April when a spate of media reports claimed that thousands of the amphibians had died in Hamburg's Altona ...
Some results have been hidden because they may be inaccessible to you
Show inaccessible results