One of the world's oldest scientific institutions is marking the start of its 350th year by putting 60 of its most memorable research papers online.
The Royal Society, founded in London in 1660, is making public manuscripts by figures like Sir Isaac Newton.
Benjamin Franklin's account of his infamous kite-flying experiment is also available on the Trailblazing website.
Society president Lord Rees said the papers documented some of the most "thrilling moments" in science history.
The Royal Society grew out of the so-called "Invisible College" of thinkers who began meeting in the mid-1640s to discuss science and philosophy.
Its official foundation date is 28 November 1660 and thereafter it met weekly to debate and witness experiments.