- Hedy Lamarr (german-way.com)
Hedwig Eva Maria Kiesler (1914-2000) was born in Vienna in the year that the First World War began (9 November 1914). Later known as the screen star Hedy Lamarr, the clever Austrian would play an interesting off-screen role as an inventor in the Second World War – on the side of her adopted US homeland. This is just one of many facts that make Lamarr’s biography quite unlike that of most film stars.
- Summation (Wikipedia)
In mathematics, summation is the addition of a sequence of numbers, called addends or summands; the result is their sum or total. Beside numbers, other types of values can be summed as well: functions, vectors, matrices, polynomials and, in general, elements of any type of mathematical objects on which an operation denoted “+” is defined.