Jupiter Hammon of Long Island, New York, publishes a book of poetry. This is believed to be the first volume written and published by an African-American

New Jersey prohibits the enlistment of slaves in the militia without their master's permission.

King George III ascends the English throne.

Joseph Gottlieb Kölreuter'S Vorläufige nachricht von einigen das geschlecht der pflantzen betreffende versuche and beobachtungen describes his research in heredity in plants.

Giovanni Arduino proposes a naming system for geologic strata, in order of oldest to youngest: Primary: lacking fossils; Secondary: tilted with fossils; Tertiary: horizontal with fossils; Quaternary: sands and gravels overlying Tertiary strata. Although he does not relate these systems to scripture, many people will interpret them in terms of biblical events.

Photometria by German physicist Johann Lambert is an investigation of light reflections from planets, introducing the term ALBEDO (whiteness) for the differing reflectivities of planetary bodies.

In experiments with primitive apparatus, Daniel Bernoulli decides that the electrical force obeys an inverse square law similar to that of gravity.

The Swiss physicist Johann Heinrich Lambert supports Wright and Kant s hierarchical universe and nebular hypothesis, and also hypothesizes that the stars near the Sun are part of a group which travel together through the Milky Way, and that there are many such groupings or star systems throughout the galaxy.

Jean-Baptiste Robinet's five-volume De la nature claims that organic species form a linear scale of progress, without gaps.

Between 1761 and 1766, Joseph Gottlieb Kölreuter (Germany) demonstrates that hybrid offspring receive traits from both parents (pollen and ovule transmit genetic information), and are intermediate in most traits. First scientific hybrid produced (tobacco). Demonstrates the identity of reciprocal crosses. Notes hybrid vigor, segregation of offspring (parental and non-parental types) from a hybrid.

Joseph Black discovers latent heat by finding that ice, when melting, absorbs heat without changing in temperature. Later he measures the latent heat of steam — that is, the heat required to keep water boiling without raising its temperature.

English poet, playwright, and novelist Oliver Goldsmith's Letters from a Citizen of the World is published, a collection of satirical essays on Britain from the point of view of a fictitious Chinese visitor.

French philosopher Jean-Jacques Rousseau writes a philosophical treatise on government and the populace, The Social Contract.

Austrian composer Wolfgang Amadeus Mozart, age 6, tours Europe as a musical prodigy.

Virginia restricts voting rights to white men.

Catherine the Great becomes Empress of all the Russias after death of her husband.

Charles Bonnet's Considerations sur les corps organisées gives his theory of "preformation" — the idea that each creature is already preformed in miniature in the egg, and that the egg contains all future generations in even smaller scale, ad infinitum.

George III purchases the Paper Museum of Cassiano Dal Pozzo, a 17th- century patron of arts and sciences. Preserved by the Albani family, this "museum" contains more than 7,000 science illustrations, including highly accurate depictions from the Lincean Academy that will prove invaluable to later science historians.

On May 16, English critic and writer Samuel Johnson meets the young Scotsman James Boswell, who will become his biographer.

Charles Mason and Jeremiah Dixon begin surveying Mason-Dixon Line between Pennsylvania and Maryland.

Chief Pontiac leads a Native American rebellion against British settlers in and around Detroit.

The French Indian War ends with the Treaty of Paris surrendering Canada to England.

Austrian composer Wolfgang Amadeus Mozart, age eight, writes his first symphony.

German archaeologist and critic Johann Winckelmann publishes his History of Ancient Art Among the Greeks, the first book to include the phrase "history of art" in the title.

Britain enacts Quartering Act, requiring colonists to provide temporary housing to British soldiers.

Stamp Act passed; this is the first direct British tax on colonists.

Italian biologist Lazzaro Spallanzani suggests preserving food by sealing it in containers that do not permit air to penetrate.

Leonhard Euler gives a general treatment of the motion of rigid bodies, including the precession and nutation of earth, in Theoria motus corporum solidorum seu rigidorum (Theory of the motion of solid and rigid bodies).

Bifocal spectacles are invented by Benjamin Franklin.

First fire escape patented, consisting of a wicker basket on a pulley and chain.

Britain repeals the Stamp Act.

Albrecht von Haller is the first to show that nerves stimulate muscles to contract and that all nerves lead to the spinal cord and the brain.

Horace-Bénédict de Saussure invents the electrometer, a device for measuring the electric potential by means of the attraction or repulsion of charged bodies.

Mozart's opera "Apollo et Hyacinthus," premieres in Salzburg.

Britain passes Townshend Revenue Act levying taxes on America.

The Virginia House of Burgess boycotts the British slave trade in protest of the Townsend Acts. Georgia and the Carolinas follow suit.

Benjamin Franklin writes a thank-you letter to a wealthy Irish trader for a box of proboscidian "tusks and grinders." Franklin believes the remains belong to elephants but makes astute observations about how their climate must have differed from the present.

Britain's Capt. James Cook begins exploring the Pacific, putting ashore in such places as New Zealand and Australia.

Lazzaro Spallanzani's Prodromo d'un ouvrage sur les reproductions animales (Foreword to a work on animal reproduction) tells of his demonstration that spontaneous generation of animals does not take place in tightly closed bottles that have been boiled for more than 30 minutes.

Caspar Friedrich Wolff's De formatione intestinarum establishes principles of the formation of organs in embryos.

James Cook sets sail on the Endeavour bound for the South Pacific. Accompanying Cook is naturalist Joseph Banks, who will collect tens of thousands of plant and animal specimens and initiate the exchange of flora and fauna between Europe, the Americas and the South Seas.

Father Junipero Serra founds Mission San Diego, first mission in California.

James Watt patents the modern steam engine, which finds wide use in manufacturing. It is an early milestone of the Industrial Revolution.

Charles Bonnet's Philosophical palingenesis, or ideas on the past and future states of living beings contains his view that the females of every species contain the germs of all future generations.

John Robison measures the repulsion between two charged bodies and shows that this force is inversely proportional to the distance between the two bodies.