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 ...
Our team of savvy editors independently handpicks all recommendations. If you make a purchase through our links, we may earn a commission. Deals and coupons were accurate at the time of publication ...
Some results have been hidden because they may be inaccessible to you
Show inaccessible results