Roentgen invented:
Who invented Aeroplane ?
Electric lamp was invented by:
What James Watt invented?
Diving bell
Steam boat
Hot air balloon
Rotary steam engine
Who invented Television ?
When was the first elevator built?
1743
1739
1760
1785
Who is the English physicist responsible for the 'Big Bang Theory'?
Albert Einstein
Michael Skube
George Gamow
Roger Penrose
