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Tôn Thất Minh Nhật

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last 3 solved tasks
Look carefully negative image and guess the name of musician.
A boy is twice as old as his sister, and half as old as their father. In 50 years, his sister will be half as old as their father. How old is the boy now?
Remove 6 letters from this sequence (PSTYCRHEADENCLIEC) to reveal a familiar English word.

Georg von Peurbach

Died 8 Apr 1461 at age 37 (born 30 May 1423).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.]

Dancing duck

A circus owner walked into a bar to see everyone crowded about a table watching a little show. On the table was an upside down pot and a duck tap dancing on it. The circus owner was so impressed that he offered to buy the duck from its owner. After some wheeling and dealing, they settled for $10,000 for the duck and the pot.

Three days later the circus owner runs back to the bar in anger, "Your duck is a ripoff! I put him on the pot before a whole audience, and he didn't dance a single step!"

"So?" asked the ducks former owner, "did you remember to light the candle under the pot?"

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