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#Lavender leaf - This false-colored scanning electron micrograph (SEM) shows a lavender leaf (Lavandula), imaged at 200 microns. Lavender yields an essential oil with sweet overtones, which can be used in balms, salves, #perfumes, #cosmetics and topical applications. Credit: Annie Cavanagh / Wellcome Images

#Caffeine crystals - This false-colored scanning electron micrograph (SEM) shows caffeine crystals. In plants, caffeine functions as a defence mechanism. Found in varying quantities in the seeds, leaves and fruit of some plants, caffeine acts as a natural pesticide that paralyses and kills certain insects feeding on the plant. The whole crystal group is 40 microns in length. Credit: Annie Cavanagh / Wellcome Images

Micro-needle vaccine - This scanning electron micrograph shows an array of 'microneedles' made from a biodegradable polymer. These materials can deliver vaccines and therapeutics to the outer layers of the skin in a safe and painless way. Credit: Peter DeMuth / Wellcome Images

One of the ten finalists in the 2012 New Scientist Eureka Prize for Science Photography. This image, 'Another Day in the Life of Arabidopsis', shows a small, six-day-old seedling of Arabidopsis thaliana under a scanning electron microscope and captures the essence of seed germination, the tiny and delicate beginnings of a plant. The image has been artificially coloured to resemble the natural colours of the living seedling. Photo: Mark Talbot

Moth fly - This false-colored scanning electron micrograph shows a moth fly (Psychodidae), also known as a drain fly. As its name suggests, the fly's larvae commonly live and grow in domestic drains: the adult fly emerges near sinks, baths and lavatories. The moth flies' body and wings are covered in hairs, which gives them a 'fuzzy', moth-like appearance. The fly is 4-5 mm long, and each eye is approximately 100 microns wide. Credit: Kevin MacKenzie, University of Aberdeen / Wellcome Images