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Mihajlo Mihajlo

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last 3 solved tasks
How many squares do you see?
Author: Nebojsa Jevtovic (Serbia)
Who is the mysterious person in the picture?

Pierre Berthier

Died 24 Aug 1861 at age 79 (born 3 Jul 1782).French mineralogist and mining engineer who discovered bauxite (aluminium ore) on 23 Mar 1821 near the village Les Baux de Provence in southern France. On 24 May 1806, he joined the central laboratory at the Board of Mines. From 1816, he was chief of the laboratory at the École des Mines, and professor of assaying. Berthier analyzed kaolin along with dozens of other minerals and ores. He sought out phosphate deposits valuable for agriculture. He published a treatise (1943) of practical analytical procedures that were widely used by other mineralogists. In another field, Berthier noticed - before Mitscherlich - that isomorphism occurred whereby chemically different substances can have the same crystalline form and even co-crystallise.«

Greeting Card Quest

A little boy had been pawing over the stock of greeting cards at a stationery store.
After a few minutes the clerk became curious and asked, "Just what is it you're looking for, sonny? Birthday greeting? Message to a sick friend? Anniversary congratulations to your mom and dad?"
The boy shook his head, "No."
"Then what kind of card is it that you want?" asked the clerk.
The boy answered wistfully, "Got anything in the line of blank report cards?"

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