Madame Curie
Discoveries : Radium, Radioactivity

Mandel
Discovery : Laws Of Heredity Gregory

Marcello Malpighi
Discovery : Microscopic Anatomy

Marcony
Discovery : Wireless Telegraphy

Maria Montessori
Discovery : Montessori Method

Max Born
Discovery : Quantum Mechanics

Max Delbruck
Discovery : Bacteriophage

Max Planck
Discoveries : Quanta, Quantum Theory

Meghnad Saha
Discovery : Effect Of Pressure On Trough Bodies

Mendel
Discovery : Laws Of Inheritance Gregor

Mendeleef
Discovery : Periodic Law

Mergenthaler
Discovery : Linotype

Michael Faraday
Discoveries : Classical Field Theory, Dynamo, Electric Generator, Transformer

Mosley
Discovery : Atomic Number

Motion Kepler
Discovery : Laws Of Planetary

Murray Gell-Mann
Discovery : Eightfold Way

Machine Gun : Dr. Richard Gatling
Malarial Parasite : Ronald Ross
Match (safety) : J.E. Lurdstrom
Mathematical Astro Physics : Chandrasekhar
Mathematical Genius : Carl Gauss (Karl Friedrich Gauss)
Mauve : dye Perkin
Measurement of Electrical Energy Joule : James Prescoft
Mechanical Equivalent of Heat : Joules
Mercury Thermometer : Fahrenheit
Meson Hideki : Yakawa Microphone : Johann Phillip Reis, Alexander Graham Bell, Elisha Gray, Amos E. Dolbear, and Thomas Edison
Microscopic Anatomy : Marcello Malpighi
Modern Anthropology : Franz Boas
Modern Astronomy : Arthur Eddington
Modern Computer : John von Neumann
Modern Geology : Charles Lyell
Modern Physiology : William Bayliss
Modern Synthesis : Theodosius Dobzhansky
Modern Telescope : Edwin Hubble
Molecular Biology : Francis Crick
Molecular Scattering of light in fluid : Ramanathan
Montessori Method : Maria Montessori
Motion of the Planets : Johannes Kepler
Motor Car (petrol) : Karl Butler
Movie Projector : Thomas Alva Edison