When Mrs. Bellamy turns up dead, having been stabbed with a pair of scissors, Homer and Marge are the prime suspects in the murder, even though they witnessed a man with braces leaving the murder scene, with Mrs. Bellamy's necklace.
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One day, the two find Mrs. Bellamy dead in her house, having been stabbed by a man with braces who quickly escapes the murder scene.
Flavia may have braces and pigtails like a typical 11-year-old girl, but she is also a brilliant amateur chemist with a specialty in poisons and a fully equipped, personal laboratory on the top floor of her home.
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One example is the prevalence of dental braces using SMA technology to exert constant tooth-moving forces on the teeth; the nitinol archwire was developed in 1972 by orthodontist George Andreasen.