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David (MK) – Flickr

Carl Zeiss Microscopy – Flickr

Carl Zeiss AG, Deutschland

wellcome images – Flickr

St Stev – Flickr

Bild: St Stev

Beetle tracheas

Tracheal tubes are visible in this synchrotron x-ray phase contrast image (right) of a tenebrionid beetle (left). See: Alexander et al., “Increase in tracheal investment with beetle size supports hypothesis of oxygen limitation on insect gigantism,” Proc. Natl. Acad. Sci. USA 104(32), 13198 (August 7, 2007). DOI: 10.1073pnas.0611544104. (Courtesy: The Field Museum of Natural History, Chicago, IL; and Argonne National Laboratory)This image was created with the use of the Advanced Photon Source, located at Argonne National Laboratory, in Illinois. The APS is the source of the brightest X-rays in the Western Hemisphere.Courtesy Argonne National Laboratory.

Comparative thickness of human hair

Credit: Anne Weston, LRI, CRUK. Wellcome Imagesimages@wellcome.ac.ukimages.wellcome.ac.ukThis image shows the difference in thickness of human hair between different ethnic groups. The strand of hair on the left is that of a Caucasian blonde female. The hair on the right is from an Asian male. Hair is normally comprised of three layers, the inner medulla, the cortex and the cuticle. The cuticle is the outermost layer and is comprised of numberous overlapping cells or scales. The cortex makes up the majority of the hair thickness. Interestingly, the inner medulla is not present in blond hair.Scanning electron micrograph

wellcome images – Flickr