Filipino scientist Gregorio Y. Zara (D.Sc. Physics) invented, made improvements to, or discovered the following:invented the two-way television telephone or videophone (1955) patented as a photo phone signal separator network"discovered the physical law of electrical kinetic resistance called the Zara effect around 1930)invented an airplane engine that ran on plain alcohol as fuel (1952)improved methods of producing solar energy including creating new designs for a solar water heater (SolarSorber), a sun stove, and a solar battery (1960s)invented a propeller-cutting machine (1952)designed a microscope with a collapsible stagehelped design the robot Marex X-10
* invented the two-way television telephone or videophone (1955) patented as a "photo phone signal separator network" * discovered the physical law of electrical kinetic resistance called the Zara effect (around 1930) * invented an airplane engine that ran on plain alcohol as fuel (1952) * improved methods of producing solar energy including creating new designs for a solar water heater (SolarSorber), a sun stove, and a solar battery (1960s) * invented a propeller-cutting machine (1952)