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