Last night, Spike Walker, one of Wellcome Images most prolific contributors - and over the years a multiple Wellcome Image Award winner - was awarded the Royal Photographic Society's Combined Royal Colleges Medal.
For more on Spike's work, see this post on the Wellcome Trust's Blog and also this gallery on the Guardian's website. A search for Spike's name on the Wellcome Images website will also bring up even more examples of his astonishing imagery, including the image shown above of a water flea giving birth.