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Look at me. I can bring a sm...

Look at me. I can bring a smile to your face, a tear to your eye, or even a thought to your mind. But, I can't be seen. What am I?

Correct answers: 43

The first user who solved this task is Sanja Šabović.

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My friend's dad is a dentist...

My friend's dad is a dentist. This is his pumpkin for Halloween.

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Johannes Nikolaus Tetens

Born 16 Sep 1736; died 17 Aug 1807 at age 70.German natural philosopher whose empirical approach strongly influenced the work of Immanuel Kant, and later in his life, Tetens became interested in mathematics, especially in actuarial applications. From 1760, as a teacher of natural philosophy he wrote on diverse topics but later began the development of the field of developmental psychology in Germany. He wrote Philosophische Versuche über die menschliche Natur und ihre Entwickelung (1777) on the origin and structure of knowledge. He changed career after 1789 to the civil service during which time he pursued mathematics. As a statistician he produced an Introduction to the Calculation of Life Annuities (1785) and On the Tetens Mortality Curve (1785).«

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