The playoff beard's growth from non-existence to ubiquitous tradition offers insights into how cultural norms emerge, spread and change over time.
What began as a possible tribute to a tennis star and a team-bonding ritual had become an ingrained part of hockey culture.
As beards have become more common in general society and even among players year-round, it's becoming harder to distinguish a dedicated playoff beard.
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Some of the biggest public companies in the United States, including Wal-Mart, Walt Disney Co., Microsoft, have adopted carbon pollution pricing strategies.