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James Lillard

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61. Pratima Singh 215
62. Luděk Štrobl 204
63. James Lillard 202
64. ভাস্কৰ জ্যোতি 202
65. Dejan Radovanović 202
last 3 solved tasks
Which number replaces the question mark?
The computer chose a secret code (sequence of 4 digits from 1 to 6). Your goal is to find that code. Black circles indicate the number of hits on the right spot. White circles indicate the number of hits on the wrong spot.
The computer chose a secret code (sequence of 4 digits from 1 to 6). Your goal is to find that code. Black circles indicate the number of hits on the right spot. White circles indicate the number of hits on the wrong spot.

Jean(-Rodolphe) Perronet

Died 27 Feb 1794 at age 85 (born 8 Oct 1708).Jean-Rodolphe Perronet was a French civil engineer who was renowned for his stone-arch bridges, especially the Pont de la Concorde, Paris. During construction of a bridge at Mantes in 1763, Perronet made the discovery that the horizontal thrust of a series of elliptical arches was passed along to the abutments at the ends of the bridge. Thus he was able to build extremely flat arches that were supported during construction by timbering (falsework) and mounted on very slender piers, which widened the waterway for navigation and reduced scour from the current.

The teacher noticed that Johnn...

The teacher noticed that Johnny had been day dreaming for a long time. She decided to get his attention."Johnny," she said, "If the world is 25,000 miles around and eggs are sixty cents a dozen, how old am I? "Thirty-four," Johnny answered unhesitatingly.
The teacher replied "Well, that's not far from my actual age. Tell me...how did you guess?"
Oh, there's nothing to it," Johnny said. "My big sister is seventeen and she's only half-crazy."
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