Alexander Graham Bell (First practical telephone)
Edinburgh
Hidetsugu Yagi ('Yagi' radio antennae)
Osaka
Igor Sikorsky (Helicopters and fixed-wing aircraft)
Kyiv
David Warren (Aircraft 'black box' recorders)
Groote Eylandt
Samuel Morse (Telegraphy and Morse code)
Charlestown, MA
Nikola Tesla (Alternating current supply)
Smiljan
Anders Celsius (Astronomy, Centigrade scale)
Uppsala
Sergey Ilyushin (Aircraft design)
Dilyalevo
Karl Benz (First practical modern automobile)
Mühlburg
Antoni van Leeuwenhoek (Microscopy)
Delft
Linus Torvalds (Linux operating system)
Helsinki
Rudolf Diesel (Diesel engine)
Paris
Robert Boyle (Chemistry and scientific method)
Lismore
Ibn al-Haytham (Mathematics and astronomy)
Basra
Alois Senefelder (Lithographic printing)
Prague
Alessandro Volta (Electric battery)
Como
Juan de la Cierva (Autogyro, rotor-wing dynamics)
Murcia
Niels Bohr (Atomic structure and quantum theory)
Copenhagen
Marie Curie (Discovery of Polonium and Radium)
Warsaw
László Bíró (Ballpoint pen)
Budapest
Australia
Croatia
Czech Republic
Denmark
Finland
France
Germany
Hungary
Iraq
Ireland
Italy
Japan
Netherlands
Poland
Russia
Spain
Sweden
UK
Ukraine
USA
Correct!
Incorrect
You left this blank