In southern Spain’s Cave of the Bats, starting almost 10,000 years ago, people buried their dead with stunningly crafted baskets that wouldn’t shame the finest arts and crafts markets today.Armed with elaborate baskets made of the tough local grass, the first to bury their loved ones at Cueva de los Murciélagos were hunter-gatherers in the Mesolithic (at the tail end of the Ice Age). That activity then ceased for about 2,000 years, at which point a new population appeared in the cave: early farmers of the Neolithic, who interred their dead with a different type of woven-ware – and sandals...