Double, Double, Toil and Trouble Double, Double, Toil and Trouble Double, Double, Toil and Trouble is a 1993 Halloween made-for-television children's film. It stars Mary-Kate and Ashley Olsen as two adventurous little girls who discover that their Great Aunt Sophia has been trapped and cursed by her evil twin sister Agatha. On the 7th year of her imprisonment, Sophia will be doomed to the netherworld unless the curse is broken by the magical spell of twins. The film's title is part of the famous line spoken by the three witches in Shakespeare's Macbeth (Act IV, Scene I): "Double, double toil and trouble; Fire burn and
Bubble net feeding a cooperative feeding method used by groups of humpback whales. This behavior is not instinctual, it is learned. Not every population of humpbacks know how to bubble net feed according to some studies. After observing different populations it is apparent which whales know how to create a bubble net and which do not. To be successful, they must learn the method. Humpback whales use vocalizations to communicate to one another and effectively and efficiently execute the bubble net so they all can feed. As the group circles a school of small fish such as salmon, krill, or herring they use