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Quang Ngô

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last 3 solved tasks
If c2233 - 1433a = 3ba9c find number abc. Multiple solutions may exist.
During what month do people sleep the least?
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.

Wolfgang Ostwald

Born 27 May 1883; died 22 Nov 1943 at age 60.German chemist who devoted his life as a teacher, researcher, editor and one of the founders of colloid chemistry. He defined colloids as disperse systems that are generally polyphasic and that possess particles 1-100 millimicrons in size. He discovered the rule of colour dispersion in the optics of colloidal systems, explained colloids' irregular flow behaviour, textural viscosity, and textural turbulence, and developed a method of foam analysis. He edited (from 1909) Kolloidchemische Beihefte and other journals and as the founder (1922) and president of the Kolloid Gesellschaft, Ostwald advanced research in colloids. He was the second child of 1909 Nobel Laureate Friedrich Wilhelm Ostwald.

Loud Train

A man had to attend a large convention in Chicago. On this particular trip he decided to bring his wife. When they arrived at their hotel and were shown to their room, the man said: "You rest here while I register - I'll be back within an hour."
The wife lies down on the bed... just then, an elevated train passes by very close to the window and shakes the room so hard she's thrown out of the bed. Thinking this must be a freak occurrence, she lies down once more. Again a train shakes the room so violently, she's pitched to the floor.
Exasperated, she calls the front desk, asks for the manager. The manager says he'll be right up. The manager (naturally) is sceptical but the wife insists the story is true.
"Look,... lie here on the bed - you'll be thrown right to the floor!"
So he lies down next to the wife... Just then the husband walks in. "What," he says, "are you doing here?"
The manager replies: "Would you believe I'm waiting for a train?"

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