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Mackie Suansing

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80. 손진환 79
81. Joan Brioso 71
82. Mackie Suansing 67
83. Hannah Wager 64
84. Mihajlo Mihajlo 63
last 3 solved tasks
What room can no one enter?
What has four legs and a back, but can't walk?
Find the next number in this series: 5, 7, 12, 19, 31, 50, ?

Georg von Peurbach

Born 30 May 1423; died 8 Apr 1461 at age 37.Austrian mathematician and astronomer who promoted the use of Arabic numerals (introduced 250 years earlier in place of Roman numerals), especially in a table of sines he calculated with unprecedented accuracy. He died before this project was finished, and his pupil, Regiomontanus continued it until his own death. Peurbach was a follower of Ptolomy's astronomy. He insisted on the solid reality of the crystal spheres of the planets, going somewhat further than in Ptolomy's writings. He calculated tables of eclipses in Tabulae Ecclipsium, observed Halley's comet in Jun 1456 and the lunar eclipse of 3 Sep 1457 from a site near Vienna. Peurbach wrote on astronomy, his observations and devised astronomical instruments.[Image: from Epitome of the Almagest.]

Playing Doctor

Steve complained to his friend Al that lovemaking with his wife was becoming routine and boring.
"Get creative buddy. Break up the monotony. Why don't you try playing doctor for an hour?"
"Sounds great," Steve replied, "but how do you make it last for an hour?"
"Hell, just keep her in the waiting room for 45 minutes!"

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