Food
This fruit can float on water because about 25% of it is air
an apple
This mammal is the largest animal to ever live on Earth
blue whale
This country is both a continent and its own nation
Australia
This stage of sleep is when most vivid dreaming occurs
REM sleep
The adult human body typically has this number of bones
206
This mineral was once used as currency in ancient times because it was so valuable
Salt
The only land animal that cannot jump, despite its massive size and speed
elephant
This rainforest is the largest tropical rainforest in the world and produces much of the world’s oxygen
amazon rain forest
This common habit, like walking or typing, is controlled by memory systems that allow you to do it without thinking
muscle memory (procedural memory)
This organ is the largest in the human body and protects everything
skin
This nut is not actually a nut, but a legume that grows underground
peanut
This fish can inflate its body to protect itself from predators
pufferfish
This lake is the largest freshwater lake by surface area in the world
Lake Superior
This chemical increases during stress and prepares your body for a “fight or flight” response
cortisol
This part of the body contains the smallest bones, including the tiny stirrup bone
ear
This grain feeds more than half the world’s population as a staple food
rice
This land animal has the longest tongue relative to its body size and uses it to catch insects
cameleon
This mountain is the tallest in Africa and is actually a dormant volcano
Mount Kilimanjaro
This common experience happens when your brain is trying to recall a word but can’t quite access it right away
“tip-of-the-tongue”
This part of the body continues to grow throughout your life, including cartilage
ears (and nose)
This tropical fruit contains an enzyme that can break down proteins and is often used to tenderize meat
pineapple
This bird is the only one that can fly backward and hover in place
hummingbird
This country is known as the “Land of Fire and Ice” because of its volcanoes and glaciers
Iceland
This ability of the brain allows it to change and adapt by forming new connections throughout life
neuroplasticity
Even stronger than bone, this type of tissue is known as the hardest substance in the human body
tooth enamel