Why did Wright Brothers build their own engine?
There was no such powerful engine available.
The engine was too expensive.
Who invented the first telescope?
Neil Armstrong
Alexander Graham Bell
Hans Lippershey
Galileo Galilei
A sundial/shadow clock can be useful in
stormy days
sunny days
rainy days
cloudy days
What is NOT a timekeeping device back in the older days?
candle clock
sundial/shadow clock
smartwatch
water clock
Who invented papers?
Cai Lun
Charles Babbage
What is the object that casts a shadow on the dial of a sundial?
dial
gnomon
Who created the first long-lasting light bulb?
Alexander Graham Bell
Thomas Watson
Thomas Edison
Galileo Galilei
Who invented a computer?
Charles Babbage
Cai Lun
Thomas Watson
Hans Lippershey
What gas that lifts up an airship to the sky?
Hydrogen
Helium
Oxygen
Krypton
Who discovered the law of pendulum?
Thomas Watson
Galileo Galilei
Montgolfier Brothers
Charles Babbage
Who invented the first engine-powered glider?
Hans Lippershey
Abbas Ibn Firnas
Wright Brothers
Montgolfier Brothers
Who was the first to aim a telescope to the sky?
Charles Babbage
Galileo Galilei
Hans Lippershey
Wright Brothers
What is an invention?
A new creation.
A plagiarism.