Who is Wilhelm Rontgen?

Why does water drop spread on glass surface while mercury does not? Who proposed the wave model of an atom? What force makes a ship float? What factors does the kinetic energy of a body depend on? Why doesn't solar cells run out of electrons? What law says gravity depends on mass ans distance? Do all moving objects don't have momentum? Where does the energy go if potential or kinetic energy isn't converted? How center of gravity determines whether the objects is at rest or in motion.? What is a syphymanometer? What should be the area of wings of a flying machine whose weight is 100 kg? How can you make a wedge? How could you use the word pulsate in a sentence? Which contact force always acts against the direction of movementWhich contact force always acts against the direction of movement? What to quantitative methods can you use to use to analyze uniform motion? Why we use odd harmonic and do not use even harmonic? It usually take more force to start an object sliding than it does to keep an object sliding because static friction is usually than sliding friction? What inventions were made using the theory of relativity? How can you make an object to have zero gravity? What are 3 things that are infinitesimal?

Who is Wilhelm Rontgen?