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$Small intestine. Coloured scanning electron micrograph (SEM) of a freeze-fractured of the small intestine. The surface consists of deep folds, called villi. The intestinal surface( pink) is exposed to food — Stock Photo$

Small intestine. Coloured scanning electron micrograph (SEM) of a freeze-fractured of the small intestine. The surface consists of deep folds, called villi. The intestinal surface( pink) is exposed to food

Computer illustration of the basal ganglia, showing caudate nucleus (green), putamen (yellow), and lateral ventricles (blue).

Human smooth muscle, light micrograph. Haematoxylin and eosin stain.

Stomach lining. Coloured scanning electron micrograph (SEM) of the glandular lining (mucosa) of the stomach. The gastric mucosa secretes the digestive enzymes and hydrochloric acid

Human eye nerve, light micrograph. Haematoxylin and eosin stain.

Mitochondria cross-section, illustration. Mitochondria are organelles found in the cytoplasm of eukaryotic cells. They oxidise sugars and fats to produce energy in a process called cellular respiration

Stomach lining. Coloured scanning electron micrograph (SEM) of the glandular lining (mucosa) of the stomach. The gastric mucosa secretes the digestive enzymes and hydrochloric acid

Male barista wearing black baseball cap and face mask working behind counter.

Tendon, coloured scanning electron micrograph (SEM), showing bundles of collagen fibres. The parallel alignment of the fibres make tendons inelastic but flexible. Tendons attach muscle to bone

Hair follicles. Coloured scanning electron micrograph (SEM). The outer layer of hair (the cuticle) has overlapping scales of keratin. These scales are thought to prevent hairs from matting together

Blond waitress wearing face mask working in a cafe.

Light micrograph of a colon biopsy from a colonoscopy. The pathology report describes normal colonic mucosa fragment with colic glands. Haematoxylin and eosin stain.

$Intestinal lining. Coloured scanning electron micrograph (SEM) of a freeze-fractured of the small intestine. The surface consists of deep folds, called villi. The intestinal surface( yellow) is exposed to food — Stock Photo$

Intestinal lining. Coloured scanning electron micrograph (SEM) of a freeze-fractured of the small intestine. The surface consists of deep folds, called villi. The intestinal surface( yellow) is exposed to food

Blond waitress wearing face mask working in a cafe.

Three young children working on an art project at home

Human brain with highlighted corpus callosum, also known as callosal commissure, illustration. It is a wide, thick nerve tract connecting the left and right cerebral hemispheres.

Woman training and stretching indoors

Amygdala of the brain, illustration. The amygdala (red) is part of the brain's limbic system and plays a key role in processing emotions.

From above of crop anonymous hairdresser with tattoos washing hair of man with shampoo in washbasin in barbershop

From below of crop stylist with trimmer cutting hair of man in cloth face mask with cellphone in barbershop

Male hairstylist in eyeglasses making haircut to adult client in hairdressing salon during COVID 19 pandemic

Illustration of the amygdala in the brain, and a close-up view of its neurons. The amygdala (red) is part of the brain's limbic system and plays a key role in processing emotions.

Male hairstylist in eyeglasses making haircut to adult client in hairdressing salon during COVID 19 pandemic

Male hairdresser with mirror showing haircut to client in cloth face mask while looking forward in barbershop during COVID 19 pandemic

$Female doctor in latex gloves and face shield doing heart shape gesture with hands while holding chemical liquid in glass vial in clinic during coronavirus outbreak — Stock Photo$

Female doctor in latex gloves and face shield doing heart shape gesture with hands while holding chemical liquid in glass vial in clinic during coronavirus outbreak

Female medical specialist in protective uniform, latex gloves and face mask doing nasal swab test with cotton bud on African American female patient in clinic during coronavirus outbreak

Unrecognizable female medical specialist in protective uniform, latex gloves and face mask vaccinating African American female patient in clinic during coronavirus outbreak

Female medical specialist in protective uniform, latex gloves and face mask vaccinating African American female patient in clinic during coronavirus outbreak

From below of crop stylist with trimmer cutting hair of man in cloth face mask with cellphone in barbershop

Content best female friends in casual wear and face masks with hot drinks in tumblers touching elbows while looking at each other in town during coronavirus outbreak

Male hairdresser in cloth face mask with brush removing hair from cape of client in barbershop

African American woman in face mask during appointment sitting at cropped unrecognizable female doctor's office desk protected by a perspex glass shield screen at modern clinic during coronavirus outbreak

Female medical specialist in protective uniform, latex gloves and face mask vaccinating African American female patient in clinic during coronavirus outbreak

Crop anonymous hairdresser shaving man in mask with straight razor in barbershop on blurred background

Cropped unrecognizable female medical specialist in protective uniform and latex gloves vaccinating anonymous African American female patient in clinic during coronavirus outbreak

Ethnic businesswoman in cloth face mask surfing internet on tablet while sitting with crossed legs on urban bench against scooter

Stylish young female friends in casual clothes and protective masks walking on city street after shopping in grocery during COVID pandemic

Black female driver in mask sitting in modern automobile with friend in city and looking in side mirror

Substantia nigra. Illustration showing a healthy substantia nigra in a human brain. The substantia nigra plays an important role in reward, addiction, and movement. Degeneration of this structure is characteristic of Parkinson's disease.

$Female doctor in latex gloves and face shield filling in syringe from bottle with vaccine preparing to vaccinate patient in clinic during coronavirus outbreak — Stock Photo$

Female doctor in latex gloves and face shield filling in syringe from bottle with vaccine preparing to vaccinate patient in clinic during coronavirus outbreak

Young ethnic male executive in disposable mask with cellphone looking away in city on blurred background

Cheerful female medical specialist in protective uniform, latex gloves and face mask talking to African American female patient before vaccinating in clinic during coronavirus outbreak

Unrecognizable female medical specialist in protective uniform, latex gloves and face mask vaccinating African American female patient in clinic during coronavirus outbreak

Anonymous doctors in uniforms greeting each other with high five at work in hospital

Male hairdresser in textile mask trimming hair of anonymous client in armchair against mirror in barbershop

Calm young African American female in warm jacket and protective face taking photo while standing on hilltop against blurred city in twilight

Full body of stylish young multiracial male friends in casual clothes and protective masks walking on city street after shopping in grocery during COVID pandemic

$Female doctor in latex gloves and face shield filling in syringe from bottle with vaccine preparing to vaccinate patient in clinic during coronavirus outbreak — Stock Photo$

Female doctor in latex gloves and face shield filling in syringe from bottle with vaccine preparing to vaccinate patient in clinic during coronavirus outbreak