We started the week expecting to publish one David Foster Wallace post . Then, because of the 50th birthday celebration, it turned into two . And now three. We spent some time tracking down free DFW stories and essays available on the web, and they're all now listed in our collection, 800 Free eBooks for iPad, Kindle & Other Devices . But we didn't want them to escape your attention. So here they are -- 23 pieces published by David Foster Wallace between 1989 and 2011, mostly in major . publications like The New Yorker , Harper's , The Atlantic , and The Paris Review . Enjoy, and don't miss our other collections of free writings by Philip K. Dick and Neil Gaiman .
Wallace collected more than 126,000 specimens in the Malay Archipelago (more than 80,000 beetles alone). Several thousand of them represented species new to science.  One of his better-known species descriptions during this trip is that of the gliding tree frog Rhacophorus nigropalmatus , known as Wallace's flying frog . While he was exploring the archipelago, he refined his thoughts about evolution and had his famous insight on natural selection . In 1858 he sent an article outlining his theory to Darwin; it was published, along with a description of Darwin's own theory, in the same year.