Science & Nature
How the universe works, from atoms to oceans.
60 answers explained
Polar bears have black skin under their white fur.
A. True2 min
The tongue has separate zones for sweet, sour, salty, and bitter taste.
B. False2 min
Glass is technically a slow-moving liquid.
B. False2 min
Chameleons change color mainly to camouflage themselves.
B. False2 min
Wombat droppings are cube-shaped.
A. True2 min
A single bolt of lightning is hotter than the surface of the sun.
A. True2 min
There are more possible chess games than atoms in the observable universe.
A. True2 min
Which organ produces insulin in the human body?
The pancreas2 min
How many bones does an adult human body have?
2062 min
Which is the hottest planet in our solar system?
Venus2 min
Toddlers typically have how many baby teeth by around age 3?
B. 202 min
What is the largest organ in the human body?
The skin2 min
What is the only mammal capable of true sustained flight?
Bat (order Chiroptera)2 min
What is the fastest land animal on Earth?
The cheetah, which can reach speeds of up to 70–75 mph (112–120 km/h).2 min
True or false: Sharks existed before trees.
True. Sharks have existed for approximately 450 million years, while trees first appeared around 350–360 million years ago, making sharks older than trees.2 min
Which element has the chemical symbol 'Au'?
Gold2 min
What gas do plants absorb from the atmosphere?
Carbon dioxide (CO₂)2 min
Which organ in the human body produces insulin?
The pancreas2 min
What is the freezing point of water in Fahrenheit?
32°F2 min
How many bones are in the adult human body?
2062 min
Which metal is liquid at room temperature?
Mercury2 min
Which vitamin is produced when skin is exposed to sunlight?
Vitamin D2 min
Which planet has the most confirmed moons?
Saturn, with 146 confirmed moons (surpassing Jupiter's 95)2 min
True or false: Octopuses have three hearts
True2 min
What is the only mammal capable of true flight?
Bat2 min
What is the largest planet in our solar system?
Jupiter2 min
Which element makes up most of the sun's mass?
Hydrogen2 min
Which element has the chemical symbol 'Au'?
Gold2 min
What is the largest mammal on Earth?
The blue whale (Balaenoptera musculus)2 min
Darwin's famous book on evolution was published in what year?
18592 min
On average, how many hours a day do newborns sleep?
C. 14-17 hours3 min
Which planet in our solar system has the most moons?
B. Saturn2 min
Roughly what percentage of Earth's surface is covered by water?
C. 71%2 min
How many hearts does an octopus have?
C. Three2 min
What is the only mammal capable of true sustained flight?
C. Bat2 min
Venus is the hottest planet in the solar system.
A. True2 min
What is the closest star to Earth other than the Sun?
C. Proxima Centauri2 min
A newborn's stomach is roughly the size of what on their first day?
A. A cherry2 min
By their first birthday, most babies have roughly done what to their birth weight?
B. Tripled it2 min
Humans share about 60% of their DNA with bananas.
A. True2 min
Which everyday fruit is technically classified as a berry, unlike strawberries?
A. Banana2 min
Which organ produces insulin in the human body?
C. Pancreas2 min
What is the main gas that makes up Earth's atmosphere?
C. Nitrogen2 min
Which planet is closest to the sun?
C. Mercury2 min
What is the tallest animal in the world?
B. Giraffe2 min
Why do many babies' eye colors appear to change during their first year?
A. Melanin gradually builds up in the iris after birth2 min
You can hear a sound underwater
A. True2 min
Octopuses have blue blood.
A. True2 min
Sloths can hold their breath longer than dolphins.
A. True2 min
A day on Mars is almost the same length as a day on Earth.
A. True2 min
What is the smallest planet in our solar system?
B. Mercury2 min
Which metal is liquid at room temperature?
B. Mercury2 min
Which element has the chemical symbol 'Au'?
C. Gold2 min
A snail can sleep for 3 years
A. True2 min
Diamonds rain on Jupiter
A. True2 min
The Eiffel Tower shrinks in winter
A. True2 min
A cockroach can survive without a head for a week
A. True2 min
What is the largest organ in the human body?
C. Skin2 min
What is the only mammal capable of true sustained flight?
B. Bat2 min
Which planet in our solar system has the shortest day?
C. Jupiter2 min