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Bill Gates wrote rival Steve Jobs a letter as he was dying. He kept it by his bed.
Al Capone’s nickname of Scarface was due to being slashed by a rival gang member.
In 1325, rival city-states Bologna and Modena went to war after Modenese soldiers stole a bucket from a well.
Wolves are legendary because of their spine-tingling howl, which they use to communicate. A lone wolf howls to attract the attention of his pack, while communal howls may send territorial messages from one pack to another. Some howls are confrontational. Calls may be answered by rival packs. Much like barking domestic dogs, wolves may simply begin howling because a nearby wolf has already begun.