During their numerous conquests across much of the known world, Alexander the Great and his horse Bucephalas led the elite Macedonian cavalry. According to one legend, they even discovered Himalayan salt, famous today for its pinkish tint and its essential trace elements required by the body. The horses had worked hard in battle and on the trail and during a moment of respite licked the salt-covered rocks in the hills overlooking the Hyaspes River. This alerted the soldiers to the salt deposits there. Whether the anecdote is true or not, it speaks to the bond between horse and rider and...