The fortunes of war more than any other are liable to frequent fluctuations. Discuss

Definition: (noun) Information known only to a special group.
Synonyms: secret.
Usage: I would love to have Mrs. Anderson's delicious muffin recipe, but that arcanum is shared only with her blood relatives.
Discuss

Earnhardt was a seven-time champion and one of NASCAR's most successful drivers when he was killed at the 2001 Daytona 500 race. In the final lap, his car veered abruptly down the track and made contact with two others before hitting a concrete retaining wall head-on at about 160 mph (258 km/h). He was killed instantly. In the wake of the tragedy, NASCAR launched an intensive safety campaign and the Florida Legislature passed the Earnhardt Family Protection Act changing what laws? Discuss