Calculate the number 399
[7228] Calculate the number 399 - NUMBERMANIA: Calculate the number 399 using numbers [4, 2, 7, 4, 22, 670] and basic arithmetic operations (+, -, *, /). Each of the numbers can be used only once. - #brainteasers #math #numbermania - Correct Answers: 2
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Calculate the number 399

NUMBERMANIA: Calculate the number 399 using numbers [4, 2, 7, 4, 22, 670] and basic arithmetic operations (+, -, *, /). Each of the numbers can be used only once.
Correct answers: 2
#brainteasers #math #numbermania
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Fortune telling

A frog telephones the Psychic Hotline and is told: "You are going to meet a beautiful young girl who will want to know everything about you."

The frog says: "This is great! Will I meet her at a party, or what?"

"No," says the psychic: "Next semester, in her biology class."

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Dissociation theory

In 1883, Svante Arrhenius was struck by the ideas for his dissociation theory during a sleepless night. This theory explains that substances like salt (ex. sodium chloride) when dissolved in water, dissociate (separate) into electrically charged ions (ex. positive sodium ions and negative chloride ions). The idea was controversial at first, but is now a basic fact in understanding the chemistry of ionic compounds.
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