Water
What is the boiling point of water in Celsius?
What is 100°C?
What color belt usually represents the lowest rank in karate?
What is white?
What chemical does your body release at night to help you sleep?
What is melatonin?
Which ocean is the largest in the world?
What is the Pacific Ocean?
What ancient warriors fought to the death in Roman arenas for public entertainment?
What are gladiators?
What type of old clock tells time using the position of the Sun?
What is a sundial?
What is the term for rain, snow, sleet, or hail falling from the sky?
What is precipitation?
In boxing and MMA, what does “TKO” stand for?
What is Technical Knockout?
What is the name for the light just before sunrise or just after sunset?
What is twilight?
What causes ocean tides?
What is the gravitational pull of the moon (and the sun)?
In chess, what strategy involves sacrificing a piece to gain positional advantage?
What is a gambit?
What is the name of the sleep cycle that includes vivid dreams?
What is REM (Rapid Eye Movement) sleep?
What’s the name of the ocean current that brings warm water from the Gulf of Mexico across the Atlantic?
What is the Gulf Stream?
Which ancient military leader is known for using the phalanx formation in battle?
Who is Alexander the Great?
What constellation is used to find the North Star?
What is the Big Dipper?