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Perform this calculation in ...

Perform this calculation in your head, mentally adding the numbers as quickly as you can. Start with 1000 and add 40. Now add 1000. Add 30 to that, then add another 1000. Now add 20 to that result. Add another 1000 and finally, add 10 to that. What is the total?

Correct answers: 83

The first user who solved this task is Sanja Šabović.

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Birds changing lightbulb

How many birds does it take to change a lightbulb?

Ideally three, but Toucan.

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William Lever

Born 19 Sep 1851; died 7 May 1925 at age 73. William Hesketh Lever (1st Viscount Leverhulme) was a British manufacturer and philanthropist who formed the Lever Brothers soap manufacturing company (1886) with his brother James (though James was not an active participant in running the business). It was one of the first companies to manufacture soap from vegetable oils instead of tallow. From 1888, Lever established Port Sunlight, a model community providing housing and support for the company's workers, who enjoyed conditions, pay, hours, and benefits far better than found in similar industries. By 1900 the factory was producing other brands such as Lifebuoy, Lux Flakes, Monkey Brand, Vim scouring powder and Rinso. In 1914, soap production reached 60,000 tonnes.«

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