Template:Are You Sure/April 4

• ... that mathematician, logician, and philosopher Benjamin Peirce (4 April 1809 – 6 October 1880) famously said that "Mathematics is the science that draws necessary conclusions", and that Peirce was an apologist for slavery, opining that it should be condoned if it was used to allow an elite to pursue scientific inquiry?

• ... that astronomer, freemason, and writer Joseph Jérôme Lefrançois de Lalande (11 July 1732 – 4 April 1807) helped popularize astronomy, and that his planetary tables were the best available up to the end of the 18th century?

• ... mathematician Édouard Lucas (4 April 1842 – 3 October 1891) studied the Fibonacci sequence, and that the related Lucas sequences and Lucas numbers are named after him?

• ... engineer and theorist Harry Nyquist (7 February 1889 – 4 April 1976) pioneering the determination the bandwidth requirements for transmitting information, laying the foundations for later advances by Claude Shannon, which led to the development of information theory?