Space
What is the closest star other than the sun?
What is Proxima Centauri?
How strong is gravity on earth in m/s?
What bone are human babies born without?
What is the kneecap?
What is a square root?
What is a number, that when multiplied by itself gives the original number?
What animals are, generally, regarded as the smartest? (Other than humans, of course)
What is chimpanzees?
What is 2019?
What is the coldest possible temperature?
What is 0 Kelvin?
What is -273,15 Celsius?
What is -459.67 Fahrenheit?
How was penicillin discovered?
What is dirty tableware? (more specifically plates)
What is a prime?
What is the name of the scary animals that lives on madagascar?
What is aye-aye?
What is the name of the black hole in the middle of our galaxy?
What is Sagittarius A?
How can the universe die?
What is heat death of the universe?
What is the big rip?
What is the big crunch?
How many connections do your 86 billion neurons create?
What is 200 trillion?
What is a perfect number?
What is a number which the sum of all divisors equal the original number?
How many known species of mammals are there?
What is 6800?
Who discovered Uranus?
What is William Herschel?
What is 2 trillion?
What does DNA stand for?
What is deoxyribonucleic acid?
What is the rarest animal on earth?
What is northern white rhinoceros? (Only 2 individual animals left)
What is the name of the largest known black hole?
What is TON 618?
What is the name of the smallest possible length?
What is the Planck length?
What nucleotide bases make up DNA?
What is adenine (A), thymine (T), cytosine (C), guanine (G)?
What animal produces the most babies at once?
How many?
What is ocean sunfish?
What is 300 million?