Technology and the built world

Marechal Mascarenhas De Moraes hydroelectric plant

The Marechal Mascarenhas de Moraes hydroelectric plant (Peixoto plant) is a Brazilian hydroelectric station on the rio Grande in Minas Gerais that was the first large-scale power plant built there.

Marek W. Urban

Marek W. Urban (born 1953) is a Polish-American polymer and materials scientist who holds an endowed chair at Clemson University and is known for self-healing polymers that repair damage without added chemicals.

Marel

Marel was an Icelandic manufacturer of equipment, systems, and software for food processing, founded in Reykjavik in 1983 and acquired by John Bean Technologies in January 2025.

Marelli

Marelli is a global automotive parts supplier formed in 2019 from the merger of Japan's Calsonic Kansei and Italy's Magneti Marelli, with about 50,000 employees worldwide.

MareNostrum 5

MareNostrum 5 is a pre-exascale supercomputer at the Barcelona Supercomputing Center in Spain, inaugurated in December 2023 as part of the EuroHPC network and the fifth in the MareNostrum series.

Mareșal tank destroyer

The Mareșal, also known as the M-tank, was a Romanian light tank destroyer of World War II, armed with a 75 mm gun and canceled before production.

MArG 155-BR

The MArG 155-BR, also known as the MArG 155/39, is an Indian 155 mm truck-mounted howitzer developed by KSSL, a Bharat Forge company, and exported to Armenia.

Margaret Hamilton (software engineer)

Margaret Hamilton, born Margaret Heafield Hamilton in 1936, is an American computer scientist who led the MIT team that wrote the Apollo program's onboard flight software, credited with coining "software engineering."

Oct 10, 2026

Margaret Mitchell (computer scientist)

Margaret Mitchell is an American AI researcher who pioneered Model Cards, developed Seeing AI, co-led Google's Ethical AI team until 2021, and is now Chief Ethics Scientist at Hugging Face.

Margaret Sze-Tai Y. Chu

Margaret Sze-Tai Y. Chu is an American nuclear waste management expert who led the Department of Energy's Yucca Mountain repository program and was elected to the National Academy of Engineering.

Margat Castle

Margat Castle (Arabic: Qalʿat al-Marqab, قلعة المرقب) is a medieval Crusader fortress near Baniyas on the Syrian coast, one of the Knights Hospitallers' two principal strongholds until its capture by the Mamluk sultan Qalawun in 1285.

Margham Oil Field

The Margham Oil Field, also written Marghan, is an onshore gas and condensate field in Dubai, UAE, discovered in 1982 and Dubai's only commercial onshore reservoir.

Margin classifier

A margin classifier is a classification model whose decision rule is stated in terms of a margin, the signed distance from a data point to its decision boundary.

Margot S. Damaser

Margot S. Damaser is an American biomedical engineer who studies pelvic floor disorders, including stress urinary incontinence, and received the 2000 Presidential Early Career Award for Scientists and Engineers.

Margrit von Braun

Margrit von Braun is an American environmental engineer who spent three decades on the University of Idaho faculty and co-founded TerraGraphics, a hazardous waste remediation firm, in 1984.

Mari Gas Field

Mari Gas Field is a natural gas field at Daharki in Ghotki District, Sindh, Pakistan, discovered in 1957 by Esso Eastern and producing continuously since 1967.

Mari Lou Balmer-Millar

Mari Lou Balmer-Millar is an American materials scientist and Caterpillar executive who led diesel emissions technology and was elected to the National Academy of Engineering in 2026.

Mari Petroleum Co Ltd

Mari Petroleum Company Limited, renamed Mari Energies Limited in January 2025, is a Pakistani oil and gas company that operates the Mari gas field in Ghotki District, Sindh.

Maria C. Lehman

Maria C. Lehman is an American civil engineer who led transportation programs in New York State and served as president of the American Society of Civil Engineers in 2023.

Maria Forsyth

Maria Forsyth is an Australian electrochemist and Deakin Distinguished Professor known for work on ionic liquids, plastic crystals, and electrolytes for lithium and sodium batteries.

Maria Jose Alonso

María José Alonso Fernández is a Spanish pharmaceutical scientist, professor at the University of Santiago de Compostela, who pioneered nanomedicine and drug and vaccine delivery in Spain.

Oct 10, 2026

Maria Klawe

Maria Klawe is a computer scientist and mathematician who led Harvey Mudd College from 2006 to 2023, where female computer science majors rose from about 10 to 40 percent.

Maria Lukatskaya

Maria R. Lukatskaya is a Swiss-based energy materials scientist who joined ETH Zurich in 2019 and is known for her 2013 Science paper on MXene charge storage.

Maria Skeppstedt

Maria Skeppstedt is a Swedish computational linguist and senior lecturer at Stockholm University, known for negation detection in Swedish clinical text and the Stockholm EPR Corpus.

Mária Telkes

Mária Telkes (1900–1995) was a Hungarian-born physical chemist and inventor known as the Sun Queen, who built the first solar-heated home and a wartime solar still.

MariaDB

MariaDB is an open source relational database forked from MySQL in 2009 by its original author, Michael Widenius, after Oracle announced its acquisition of Sun Microsystems.

Marian E. Gindy

Marian E. Gindy is a pharmaceutical scientist and chemical engineer who is Vice President of Small Molecule Science and Technology at Merck and a 2025 National Academy of Engineering member.

Mariana lithium project

The Mariana lithium project is a brine lithium mine and lithium chloride plant in Salta Province, Argentina, wholly owned by Ganfeng Lithium and inaugurated in 2025.

Mariano Campoy‐Quiles

Mariano Campoy-Quiles is a Spanish materials scientist and CSIC Research Professor at the Institute of Materials Science of Barcelona, working on organic solar cells and thermoelectric generators.