The horses are slick with sweat, veins bulging, feet dancing through a maelstrom of legs and mallets and flying clods of earth, 6,000 pounds of flesh tumbling after a tiny white ball. The riders are ...

In Argentina, equine cloning in polo is no longer a rarity. It’s now a mature industry — although ethical dilemmas surrounding it persist. At the slightest touch of the reins, he felt a familiarity ...