RJ Mackenzie

Contributor

More from RJ Mackenzie

A close-up shot of an Asian woman with dark hair looking intently into a mirror, touching both sides of her face with her hands. Her expression is concerned or thoughtful, and she appears to be examining the skin or puffiness under her eyes. The background is bright and dominated by the reflection of a bathroom or vanity.
Ask Us Anything

Why we get dark circles and eye bags

By RJ Mackenzie

A fluffy orange and white cat is curled up and lounging inside a small, low-sided cardboard box that is lying on a wooden floor, looking directly at the viewer with a relaxed expression.
Cats

Why do cats love boxes? Evolution has an answer.

By RJ Mackenzie

A macro, close-up photograph of human skin texture showing small hairs standing straight up, a phenomenon known as goosebumps or gooseflesh. The skin tone is light, and the background is a solid, clear blue sky.
Ask Us Anything

Why you get goosebumps when you’re scared—or inspired

By RJ Mackenzie

A medical professional wearing blue surgical scrubs and white gloves holds a clear anesthesia mask over the face of a patient who is lying down. The patient's face is visible in profile, and they are wearing a white surgical cap. The scene takes place in a medical setting, possibly an operating room, with a medical monitor and other equipment blurred in the background.
Medicine

How does anesthesia work? Experts still have questions.

By RJ Mackenzie

A large female black mountain gorilla on all fours turns her head to the camera, while its young offspring with fluffy black fur rides on its back, also looking toward the camera. They are surrounded by dense green foliage in a natural habitat.
Biology

Female mountain gorillas wield a lot of power

By RJ Mackenzie

toothbrush and big tooth
Health

Don’t put charcoal on your teeth and 4 other dental no-nos

By RJ Mackenzie

Jupiter on a black background
Ask Us Anything

What would happen if you tried to land on a gas giant?

By RJ Mackenzie

Human brain going through translucent multi colored discs blue background
Health

What happens when our brain goes blank

By RJ Mackenzie

Hand holds Vintage photograph of boy on tricycle at christmas
Mental Health

Why we forget our childhoods

By RJ Mackenzie

Blue jay on city sidewalk.
Birds

What to do if you find a baby bird out of its nest

By RJ Mackenzie

a mosquito under a microscope
Insects

What would a world without mosquitoes look like?

By RJ Mackenzie

debris field in water
Pollution

The Great Pacific Garbage Patch isn’t just a floating trash pile

By RJ Mackenzie

a wrinkly hand
Ask Us Anything

Why do our fingers wrinkle in water? It’s much deeper than skin.

By RJ Mackenzie

A low-polygon human brain dissolves from top to bottom, visually representing the progression of memory loss
Diseases

How an unusual medical procedure transmitted Alzheimer’s

By RJ Mackenzie

Man shakes his head while being doused with water
Ask Us Anything

How is head hair different from body hair? 

By RJ Mackenzie

an illustration of two cockroaches
Insects

Why cockroaches are so resilient

By RJ Mackenzie

an arm covered in a rose tattoo
Ask Us Anything

Where does tattoo ink go in your body? There’s one particular spot.

By RJ Mackenzie

a body on a morgue table with only the feet showing and a toe tag on the big toe
Medicine

What happens when you donate your body to science? 

By RJ Mackenzie

couple in bed
Ask Us Anything

Do aphrodisiacs work? What the science says.

By RJ Mackenzie

Beautiful cat on red background
Cats

Why do cats make biscuits?

By RJ Mackenzie