| 41. | Perfecting the long jump will be Jones'biggest challenge.
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| 42. | He spent the next 45 years perfecting the design of his timekeepers.
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| 43. | H�ss began testing and perfecting mass killing techniques on 3 September 1941.
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| 44. | They were credited with perfecting and popularizing the hydroblading technique.
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| 45. | Aubrey has steadily worked towards perfecting his craft amidst his busy schedule.
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| 46. | Catherine's political reforms went beyond perfecting Russia's bureaucracy.
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| 47. | Bainton guided Dagger to practice further, perfecting his technique.
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| 48. | This was one of the ways he worked on perfecting his tolerance.
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| 49. | He then travel through France and Italy perfecting his art.
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| 50. | In 1901, Van Briggle had a major breakthrough perfecting his process.
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