From the Statesman:
The festival includes the tying of rakhi, a holy thread, on the brother’s wrist. It defines and determines the love and relationship between a brother and sister. It is said that the frail thread is even stronger than iron chains since the rakhi bonds brother and sister. It is a festival that expresses love and protection. The brother is supposed to accept the rakhi and show his love by gifts and money. He is also bound by his sister’s love and pledges to protect her from danger. [...]
Rakhi can be traced historically too in the following two incidents:
1. When the Rajputs were fighting the Muslim invaders. Rani Karnawati, the widow of then king of Chittor, realised that she could not resist an invasion from Bahadur Shah, the Sultan of Gujarat. She sent a rakhi to Humayun for protection from Bahadur Shah. Humayun accepted the rakhi and immediately turned his vast troops to defend Chittor and fulfil his duty as a brother.
2. This incident traces back to 300 BC when Alexander the Great was invading India. At the first attempt he was shaken by King Porus. Alexander’s wife, who had heard of “rakhi” approached King Porus and tied one around his wrist. He accepted her as a sister. During the war when Alexander fell from his chariot and King Porus was about to slay him, he remembered the rakhi given to him and drew his sword away.
I think we've had this one before ... from About.com's Cruise Guide:
Pliny once wrote, "Home is where the heart is." and over the past month or so our hearts have been at home in many distant places.
From some sort of Press Release:
The ancient Roman and Greek gazebos were the central fixtures of every home.
From an opinion piece at the CBC:
"Boys throw stones at frogs in sport," Plutarch wrote. "But frogs do not die in sport, they die in earnest."
From an opinion piece at Online Journal:
When Alexander ‘the Great’ arrested some dacoits, the latter impudently observed that they only robbed a few people, whereas Alexander robbed entire nations and was therefore called ‘the Great.’
From the Times of London:
Apart from manufacturing methane, and grazing while moving backwards (because, as Pliny the Elder noted in his Natural History of AD77, the moose’s upper lip is so large that “by moving onwards, the lip would get doubled up”), the moose has little to pass its time
From Chosun comes one I'm still thinking about in terms of implications (since JC is one of those who was supposedly left-handed):
The handshake is said to have originated from the days of Julius Caesar in ancient Rome. Caesar made it a rule to shake only with the right hand. You don't have to worry if somebody's going to attack you if you're gripping his right hand. But left-handers use their swords with their left hands. That means they shake hands with their right and wield their weapon with their left, hence lefties were regarded as untrustworthy. So the Romans used to call left-handers "sinister" in Latin, which means "unlucky" or "ominous."
One of Wired's blogs noted a thing (now expunged) in Wikipedia trying to establish an ancient origin for DRM:
"Access control was always used as a measure to disallow intellectual property from being distributed without the consent of the author/owner. The [[Library of Alexandria]] (aka "The Kings Library") wasn't a place that an average person could walk into and lend a book from. Ptolemy III paid the sum of fifteen talents of silver to be allowed to copy the works of Aeschylus, Sophocles and Euripides."