ScienceSource

Washington in masonic attire, holding scroll, and trowel. Portraits of Lafayette and Jackson in corners. He joined the Masonic Lodge in Fredericksburg, Virginia at the age of 20 in 1752. At his first inauguration in 1791, President Washington took his oath of office on a Bible from St. John's Lodge in New York. In retirement, Washington became charter Master of the newly chartered Alexandria Lodge No. 22, sat for a portrait in his Masonic regalia, and in death, was buried with Masonic honors. George Washington (February 22, 1732 - December 14, 1799) was the first President of the United States of America, serving from 1789 to 1797, and dominant military and political leader of the United States from 1775 to 1799. He led the American vict...

Marie Curie (November 7, 1867 - July 4, 1934) was a Polish-French physicist and chemist famous for her pioneering research on radioactivity. She was the first person honored with two Nobel Prizes; physics and chemistry. She shared her 1903 Nobel Prize in Physics with her husband Pierre Curie and with the physicist Henri Becquerel. She was the sole winner of the 1911 Nobel Prize in Chemistry. Curie was the first woman to win a Nobel Prize, the only woman to date to win in two fields, and the only person to win in multiple sciences. Her achievements included a theory of radioactivity (a term that she coined, techniques for isolating radioactive isotopes, and the discovery of two elements, polonium and radium. Under her direction, the world...

Elizabeth (Bessie) Coleman (January 26, 1892 - April 30, 1926) was an African-American civil aviator. She could not gain admission to American flight schools because she was black and a woman. She learned French, traveled to Paris, and in 1921, became the first woman of African-American descent to earn an international aviation license. She became a barnstorming stunt flyer and was known as Queen Bess. 

Jesse Jackson (born October 8, 1941) in Washingon, D.C., c.1988. Jackson is an American civil rights activist, Baptist minister and politician. He was the Democratic presidential nominee in 1984 and 1988. He served as shadow senator for the District of Columbia from 1991 to 1997.

A white blood cell engulfing bacteria in a process called phagocytosis. Neutrophils are phagocytes, capable of ingesting microorganisms or particles, in this case bacteria. Computer generated image.

Happy adult Golden Retriever dog.

Colorado Rocky Mountain Scenic Autumn Landscape © Michael Lustbader/SCIENCE SOURCE

Purple Field of Flowers, Desert Verbena. Desert Sand Verbena (Abronia villosa) in Anza Borrego, California, during the 2019 spring super bloom, after a wet winter.

Chevreul's "chromatic diagram," based on the RYB color model, showing complementary colors and other relationships. Color theory was originally formulated in terms of three "primary" or "primitive" colors -- red, yellow and blue (RYB) -- because these colors were believed capable of mixing all other colors. Michel Eug??ne Chevreul (1786-1889) was a French industrial chemist who is credited with the discovery of margaric acid and designing an early form of soap made from animal fats and salt. Chevreul was particularly influential in the world of art, since he determined that perceived color was influenced by other surrounding colors. This led to a concept known as simultaneous contrast. He expounded on this idea in "The Law of Simultaneou...

Monkey treefrog (Phyllomedusa vaillantii) clinging to a leaf in a rainforest in Ecuador.

Color enhanced photograph of light refraction. When light is incident from a more optically dense medium onto a less optically dense medium (for example, from glass onto air) it refracts (bends) away from the normal to the surface between the media. The angles of incidence and refraction are related through Snell's law.

A medical illustration of the kidney's nephron. It shows the veins and arteries.

Pratt's Healing Ointment for Man and Beast. This medicine claims to heal both human ailments and horse ailments such as saddle galls, open wounds, sores, scratches, and burns.

A transmission electron microscope photo of the swine flu, digitally colored.

The motion of a planets orbit around a star, simulated by rolling a ball on a curved surface of plastic. The orange ball represents a star and is resting on a sheet of plastic that stretches under its weight. The curved sheet of plastic demonstrates the way a gravity curves space.

A transmission electron microscope photo of the swine flu, digitally colored.

A Shiba Inu, also called a Japanese Small Sized Dog, sits in the forest.

A black adn white American Staffordshire Terrier, or pitbull, sits outdoors.

Color-enhanced photograph of two ripple tank probes vibrating at the same frequency generating two circular wave systems that produce the interference pattern shown. Photograph taken between 1958-61.

Margaret Fuller (May 23, 1810 - July 19, 1850) was an American journalist, editor, and critic. Drowned in a shipwreck, Margaret Fuller is the tragic heroine of the Transcendentalist movement-an idealistic American literary and philosophical movement that stressed the unity of all creation-and the first major woman intellectual in American history. She edited the Transcendentalist journal The Dial with Ralph Waldo Emerson and George Ripley and became a critic for Horace Greeley's New York Tribune. In 1839 she began a conversation group among Boston's women that led to the treatise Woman in the Nineteenth Century (1845). Oil on canvas by Thomas Hicks, 1848 (cropped and cleaned).

In 1955, Annie Easley began her career at NASA, then the National Advisory Committee for Aeronautics (NACA), as a human computer performing complex mathematical calculations. When human computers were replaced by machines, Easley evolved along with the technology. She became an adept computer programmer, using languages like the Formula Translating System (F

Mary Wollstonecraft, English Author

3D illustration of ATP synthesis in a mitochondrion. ATP synthase couples ATP (red) synthesis from ADP and inorganic phosphate (orange) to a proton gradient (light points) created across the mitochondrial membrane during cellular respiration.

An illustration showing a hospital blood bag filled with blood that has been edited using CRISPR technology. This therapy is being used and tested to cure various diseases and conditions.

Death at the Stake - right-hand part of a triptych. Oil on canvas by Hermann Anton Stilke, 1843, Hermitage Museum, St. Petersburg, Russia. Joan of Arc (January 6, 1412 - May 30, 1431) national heroine of France and a Roman Catholic saint. A peasant girl born in eastern France who claimed divine guidance, she led the French army to several important victories during the Hundred Years' War, which paved the way for the coronation of Charles VII. She was captured by the Burgundians, sold to the English, tried by an ecclesiastical court, and burned at the stake when she was 19 years old. Twenty-five years after the execution, Pope Callixtus III examined the trial, pronounced her innocent and declared her a martyr. Joan of Arc was beatified in...

West Highland White Terrier

Charlotte Bronte (1816 - 1855) is an important English novelist who is best remembered for her famous novel Jane Eyre.

Assorted shells with starfish, Sanibel Island, Florida.

Jane Austen (December 16, 1775 - July 18, 1817) was an English novelist whose works of romantic fiction, set among the landed gentry, earned her a place as one of the most widely read writers in English literature. Her realism, biting irony and social commentary as well as her acclaimed plots have gained her historical importance among scholars and critics. She lived her entire life as part of a close-knit family and was educated by her father and older brothers as well as through her own reading. From her teenage years into her thirties she experimented with various literary forms, including an epistolary novel which she then abandoned, wrote and extensively revised three major novels and began a fourth. From 1811 until 1816, with the r...

Border collie sitting in a flowery field.

Eleanor Roosevelt (1884 - 1962) was an activist, diplomat and the longest serving First Lady (March 1933 to April 1945). She was the first presidential spouse to hold press conferences, and write a syndicated newspaper column. She was a champion for civil rights of African-Americans and Asian Americans, and the rights of WWII refugees. Painting by Douglas C

SEM of mushroom mycelium, imaged in low vacuum mode at 15 000 Kv and at a magnification of 1600 x at 8" x 10". The specimen was grown on a gelatine substrate, in a laboratory environment.

Sappho, Ancient Greek Poet

Albino Chacoan horned frog (Ceratophrys cranwelli), native to Argentina, from "La Ferme Tropicale", an exotic pet shop in Paris that specializes in reptiles, amphibians and invertebrates.

Margaret Fuller (May 23, 1810 - July 19, 1850) was an American journalist, editor, and critic. She was also an advocate of women's rights, women's education and the right to employment. She encouraged many other reforms in society, including prison reform and the emancipation of slaves. She became the first editor of the transcendentalist journal The Dial in 1840, before joining the staff of the New York Tribune in 1844. Her seminal work, Woman in the Nineteenth Century, was published in 1845. A year later, she was sent to Europe for the Tribune as its first female correspondent. Engraving circa 1872 based on the portrait by Alonzo Chappel. Colorized.

The classical celestial spheres, depicted in a 17th century engraving. The seven planets encircle the earth and pass through the Zodiac signs.