Thank you for visiting nature.com. You are using a browser version with limited support for CSS. To obtain
the best experience, we recommend you use a more up to date browser (or turn off compatibility mode in
Internet Explorer). In the meantime, to ensure continued support, we are displaying the site without styles
and JavaScript.
This issue features articles on e-scooters, infective endocarditis, and dental referral letters.
Cover image: Human lip. Coloured scanning electron micrograph (SEM) of a human lip, showing sweat gland openings on the drier external lip surface. These openings (pores) release sweat onto the surface of the skin. This has the effect of cooling the body, as the sweat’s evaporation carries away heat. Magnification x300 when printed 10 cm wide.