Who invented the BALLPOINT PEN?
A.Biro BrothersB.Waterman BrothersC.Bicc BrothersD.Write Brothers
In which decade was the first solid state integrated circuit demonstrated?
What J. B. Dunlop invented?
A.Pneumatic rubber tireB.Automobile wheel rimC.Rubber bootD.Model airplanes
Which scientist discovered the radioactive element radium?
A.Isaac NewtonB.Albert EinsteinC.Benjamin FranklinD.Marie Curie
When was barb wire patented?
What is the name of the CalTech seismologist who invented the scale used to measure the magnitude of earthquakes?
A.Charles RichterB.Hiram WalkerC.Giuseppe MercalliD.Joshua Rumble
What Galileo invented?