Which adjective describes something soft and light, like fur or feathers?
Fluffy
Which word means "too many to count"?
countless
Whose famous quote about effort and difficulty opens the article?
Theodore Roosevelt
What planet in our solar system is known as the Red Planet?
Mars
What is the longest river in the world?
the Nile
Which adjective describes a strong, pleasant smell?
aromatic
Which word means "principles and methods of teaching"?
pedagogy
Which scientist used gamification to organize the Periodic Table of Elements?
Dmitri Mendeleev
What is the largest organ in the human body?
the skin
What ancient library, located in Egypt, was famous for holding one of the largest collections of scrolls and texts in the ancient world?
the Library of Alexandria
Which adjective describes light appearing in small patches, like sunlight through leaves?
dappled
Which adverb means "completely," used for emphasis?
utterly
What technology does the article say has taken gamification "to the next level"?
virtual reality / VR headsets
What gas do plants absorb from the air that humans and animals exhale?
carbon dioxide
What is the name of the ancient trade route that connected China to the Mediterranean world for centuries?
the Silk Road
Which adjective describes a sound that's hard to hear clearly, as if covered?
muffled
Which verb means "to talk proudly about something impressive you have"?
boast
What neurochemical is linked to the feeling of gratification in gamification?
dopamine
What is the hardest natural substance on Earth?
diamond
Which country has the most time zones in the world?
France
Which adjective describes something unclear or blurry, often used for an old memory?
hazy
Which phrase means "certainly true"?
no doubt
Besides adolescents, which group does the article say benefits from "brain games"?
elderly people
What is the process called by which plants make their own food using sunlight?
photosynthesis
In what year did the Berlin Wall fall?
1989