EditorialThe Fibonacci sequence, in which every term (starting with the 3rd term) is the sum of the two preceding numbers, is one of the more familiar sequences in the On-Line Encyclopedia of Integer Sequences, which first appeared as a handbook in 1973. (Tony Cenicola/The New York Times)
EditorialCempedak, Artocarpus integer. (Jack tree or entire-leaved breadfruit, Artocarpus integrifolia.) Handcoloured copperplate engraving by Swan after an illustration by William Jackson Hooker from Samuel Curtis' Botanical Magazine, London, 1828.
EditorialCempedak, Artocarpus integer. (Jack tree or entire-leaved breadfruit, Artocarpus integrifolia.) Handcoloured copperplate engraving by Swan after an illustration by William Jackson Hooker from Samuel Curtis' Botanical Magazine, London, 1828.