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813 accepted96% rate9.0 hours
In what year did Tumblr launch?
How many sides does a hexagon have?
How many planets are in the Solar System?
Which is the hardest natural mineral on the Mohs scale?
What is the capital city of Argentina?
What is the atomic number of carbon?
Which programming language was created by James Gosling at Sun Microsystems?
How many bones are in the adult human body?
How many degrees are in the interior angles of a triangle in total?
Which organ pumps blood through the human body?
What is the speed of light in a vacuum, in kilometres per second, rounded to the nearest thousand?
Which chemical element has the symbol Fe?
At what temperature in degrees Celsius does water boil at sea level?
Which city hosted the Summer Olympic Games held in 1996?
How many players are on a soccer team on the field at once?
Which company created the iPhone?
Which desert covers most of Mongolia's southern border with China?
What is the capital city of Kazakhstan?
What is the capital city of Australia?
In what year was YouTube founded?
In what year did Linus Torvalds first release the Linux kernel?
In what year did LIGO announce the first direct detection of gravitational waves?
What is the atomic number of gold?
How many protons does a helium nucleus have?
What is the speed of light in vacuum, in meters per second, as defined exactly by the SI?