View a gallery of images and videos of over 200 types of cells

A gallery of medical illustrations from NIH

The National Institutes of Health provides educational materials for broad use. The institute hosts a Flickr account with many different image galleries, including this one (with over 70 images to date) that illustrate and annotate curious phenomena, from the life cycles of a malaria parasite to the comparison of male and female bladders. Explore the gallery here.

Explore what each organelle does within various types of cells

In "Cell Anatomy Viewer," users can explore interactive illustrations of animal, plant, fungal, and bacterial cells. Clicking on an organelle, such as a lysosome, the nucleolus, or the Golgi complex, provides descriptions of its characteristics and functions.

The secret lives of cells

Cutting-edge microscopy has revealed previously unseen interactions of biological molecules within their cellular environment, enabling scientists to observe and analyze the molecules in a holistic view. This podcast explains the minute advancements made over the last few decades in observing cells, revealing how scientists have come and what the future holds for the field.

What is a cell? A great quick overview.

YourGenome.org furnishes a collection of information on cells and how they work. Every body has trillions of cells, each serving a specific function: making proteins, processing chemicals, and creating energy. Every cell contains a genome, a set of instructions for the cell's function. Brush up on your cells for a better grasp on genetics.

View a media gallery of coral reefs from around the world

Developed by The Ocean Agency, the Ocean Image Bank launched in 2021 with the help of more than 200 ocean photographers, videographers, and science organizations to help engage the public and inspire support for oceans as part of the UN Decade of Ocean Science.

View a colorful gallery of solar features curated by the National Solar Observatory

Many of the images are captured at different nonvisible wavelengths, such as UV, and then colorized into the visible range to illuminate the sun's magnetic field and magnetism-driven solar activity, including coronal loops and filamentary prominences. Close-up imaging also reveals solar granules—Texas-sized cells of material that bubble to the surface from the convection zone.

View a collection of historical documents about molecular biology's history

The collection features materials related to those involved in the discovery of DNA and provides historical context for the discoveries of RNA, various viruses, and important bioproteins. The items include photographs, business correspondence, manuscripts, and scientific instruments.

Stem cell therapies

Stem cells' special attributes interest researchers developing new therapeutic tools for a variety of health problems. Much of this research is done with support from the National Institutes of Health (NIH). This page offers a snapshot of research programs funded by the NIH and the health problems those programs focus on.

Explore human anatomy with these beautiful images

The Human Organ Atlas offers detailed 3D images of dozens of human organs. It was created with very bright X-rays from a particle accelerator, which is formally called a synchroton imaging method.

View a gallery of bioluminescent organisms, including jellyfish and mushrooms

Some species produce a quick flash of light, while others glow steadily with an eerie glow, often to seek attention or in response to being disturbed. Snails, worms, fungi, and other organisms highlight that this ability evolved independently, rather than from one common ancestor.

Explore over 46,000 pages of Charles Darwin's manuscripts

The American Museum of Natural History hosts almost 35,000 digitized folios related to evolution within the fields of botany and zoology from Darwin's Beagle voyage. High-resolution color images, geological findings, and annotated books from Darwin's personal library are also viewable.

View a media gallery from the assembly of Voyager 1 and 2

This archive includes the many steps it took to put together each Voyager probe. Photos focus on individual parts, like the 8-track tape deck, the large dish-shaped antenna, and its long arm magnetometer boom.

See rare Civil War photographs preserved by the National Archives

The Civil War was the first major American conflict documented by a camera, with its images distributed widely to the public. The National Archives' digital collection offers thousands of original Civil War images: portraits, battlefields, hospitals, and everyday life.

Explore the National Cancer Institute's archive on treatments

Cancer is a complex disease with many different types, each with its own pathology. The best treatment may depend on characteristics specific to each person—even if two people share the same type of cancer. No single overview of treatments exists, but this resource from the National Cancer Institute lets you explore different options, side effects, an A-to-Z library of cancer drugs, and much more.

All publicly available DNA sequences are available at GenBank

The National Institutes of Health's database stores comprehensive, annotated DNA sequences as part of the International Nucleotide Sequence Database Collaboration. It encourages unrestricted data access within the scientific community while allowing submitters to retain intellectual property rights over their data.

This is what happens inside your body when you're sick

This video details the biology of what happens inside the human body during illness.

Explore 3D models of some of the most dangerous viruses

Everyone has come in contact with common viruses—typically something like influenza (the common flu)—but sometimes they encounter more dangerous strains. While we're familiar with the symptoms that manifest, it wasn't until the advent of advanced microscopy that scientists could pin down the exact structure and behavior of various viruses.

The first line of 'immortal' human cells, which can divide indefinitely and are used in scientific research, was nonconsensually taken from a Black woman.

The first line of 'immortal' human cells, which can divide indefinitely and are used in scientific research, was nonconsensually taken from a Black woman.

Wafaa Bilal had a camera surgically implanted in the back of his head

The artist programmed the camera to capture one image per minute of his daily life. He explained that the project was meant to document his past—in a rather literal way—as it slipped away from him, in a mode that gestured at both surveillance and the radically objective nature of photos. Viewers can expect an immersive installation featuring thousands of mundane images transmitted to a website, challenging traditional photography and exploring the intersection of public and private information.

Visualize how CRISPR-Cas9—a type of immune system used by single-celled organisms to attack invasive viruses—targets and makes precise changes to a gene's DNA.

Get lost in these historical libraries

The internet has changed a lot about how we learn, explore new ideas, and conduct research, particularly when it comes to the spaces we learn in. While few of us would trade our smartphones for a walk in a historical library, a walk through some of the beautifully designed cathedrals of learning could remind us to put them down sometimes. Explore 10 of the world's magnificent libraries with this quick video survey.

See the most iconic photos from four decades of LIFE magazine

Explore a library of data files for 3D printing

Data files are organized by category, including gadgets, learning, and fashion, with most available in .stl format, which is native to computer-aided design software, and presliced. Some files are also available in .3mf, an open-source file format developed as a universal standard for high-fidelity 3D printing.

A visual database of pollens

Pollen is a powdery substance made up of small grains involved in the fertilization process of plants. There are thousands of types of pollens across the world, and you can see real images of them in this visual database.

See images of medical cases of firework injuries shared on this 'Instagram for doctors.' (Warning: Graphic content)

AI vs. machine learning vs. deep learning

Machine learning is best understood with visuals. A collection of the best 9 images, videos and flowcharts that explain what it is and how it works.

New eye implant clinical trial recruiting in 2026

University of Southern California researchers have launched a phase 2b clinical trial of a stem cell implant designed to restore vision in people with advanced dry macular degeneration. Patients will be randomized to receive the stem cell implant or a simulated procedure and placebo implant. This type of larger, second-stage clinical trial is designed to confirm efficacy and dosing and to look for side effects. It's one of the stages that precedes the US Food & Drug Administration approval of a device.

See how each of the more than two million known species relates to each other—and to common ancestors—in this zoomable tree of life.

Search this citation-heavy database of nutrition and supplement research

Explore a reference site that aggregates and summarizes peer-reviewed studies on hundreds of supplements and dietary interventions. It is ad-free and funded by subscriptions, making it a health resource without a financial stake in what you buy.

Bone marrow (soft tissue found inside certain bones) generates roughly 500 billion new blood cells each day

As of 2025, the most cited papers in science include a review of graphene, methods to improve image recognition, streamlining electron density calculations, and optimizing protein studies.

The syncytiotrophoblast is the outer layer of the placenta and the largest human cell, spanning an area about twice that of a king-sized bedsheet.

See these 16 pieces of art evoking phobias of snakes, flying, spiders, and more. 

Tattoos remain visible on your skin thanks to immune cells called macrophages

Visualize the path of every solar eclipse from 1900 to 2099 and see what each looks like when observed from different locations on Earth.

Read a deep dive on the 'all-purpose healing' peptide BPC-157.

Ebola is a filovirus, meaning it resembles a thread under a microscope, though it sometimes twists and can resemble a bowl of spaghetti.

Massive blooms of microscopic plankton called dinoflagellates produce the neon blue light seen in glowing tides.

Objects can be 3D printed with light by projecting 2D computerized tomography (CT) scans onto rotating cylinders of resin, which solidify upon exposure.

This real-time tracking of the hantavirus cruise ship outbreak in May 2026 offers a unique glimpse into the global reach of the outbreak and whether the virus sickened passengers and their communities around the world.

Take a 3D tour of the Hajj, Islam's annual pilgrimage to Mecca, undertaken by more than 1.5 million Muslims each year.

This site reaches millions of visitors who are tired of AI chatbots and seeking human connection. Pretend to be an AI chatbot and ask questions, provide answers, and draw for people in real time.

Alzheimer's can lead to brain shrinkage, with an average of around 2% of volume reduction per year

Explore an interactive map of battles from the American Revolution, along with detailed summaries of each engagement

Some researchers have labeled nomophobia, the fear of being without your phone, as 'the phobia of the 21st century.'

Watch this video that uses Lego bricks to explain how venture capital works.

Explore the archaeological treasures of Pompeii, the city buried under volcanic ash when Mount Vesuvius erupted in 79 CE.

Most of the observable universe's volume consists of voids and supervoids—enormous regions of space with little to no galaxies, stars, or light.

Calculate how much of your tax dollars go to each federal program based on your income, filing status, and number of children