1. 36
   98
2. 206
   872

You have fewer as they meld together. Adult humans have 206 bones when it's all said and done.

1. Blue
   Red
2. Green
   Gray

Because veins often look bluish, there's a misconception that human blood is blue until it's exposed to the environment. That's not true -- human blood is always red.

1. It can be molded with bare hands.
   It has no conductivity at all.
2. It is essentially worthless.
   It's incredibly toxic.

The purest gold is also the softest. So soft, in fact, that you can push and pull it like clay with your bare hands.

1. To increase trunk strength
   To maximize photosynthesis
2. To ward off pess
   To improve root structure

Conifers use needles (instead of bigger leaves) for photosynthesis. With their triangular shape, the trees maximize light exposure all the greatest number of needles.

1. Urinating
   Crying
2. Eating
   Blinking

Babies aren't big blinkers -- they often only blink a couple of times per minute. And scientists aren't sure why that’s the case.

1. The same elements are found everywhere.
   Mars elements are far different than those on other planets.
2. It depends on how alien races scattered them.
   Earth is home to elements found here and only here.

The same chemical elements are found most everywhere in the universe. These elements give scientists a starting point for comparisons and type of scientific experiments.

1. Offshoots of corn
   Ectothermic
2. Berries
   Mammals

There are many different types of berries on Earth … and only a few have "berry" in the name. Tomatoes? A berry. The same goes for pineapples, oranges and a lot more.

1. Their atmospheres are identical.
   They don't have moons.
2. They have nothing in common.
   Their surface temperatures are exactly the same.

All of our solar system's planets have at least one moon. Except for Venus and Mercury … they have no moons at all.

1. Copper
   Shark teeth
2. Diamond dust
   Steel

Just keep in mind that you're in over your head when you're swimming. Humans and sharks have teeth that are roughly the same toughness. But we do not advise that you test this theory in the water.

1. Calcium
   Xylem
2. Chlorophyll
   Bark

Plants use light to generate chlorophyll, a greenish pigment that makes light absorption possible in the first place. This pigment is necessary for photosynthesis.

1. Three weeks, give or take a day
   Roughly a day
2. Perhaps 4 seconds
   About 8 minutes

The sun is about 93 million miles away from Earth. Light travels at about 186,000 mph … meaning it takes about 8 minutes to cover the distances from there to here.

1. Elephants
   Alligators
2. Cockroaches
   Humans

Cockroaches are living example of durability under all conditions. They've been around for 280 million years … that's tens of millions of years earlier than even the earliest dinosaurs.

1. A dolphin
   A big fish
2. A pachyderm
   Well, it's a whale.

Killer whales aren't whales. It's the largest type of dolphin … and it can be as long as 30 feet. Expert divers can swim with killer whales and even train them to do various tricks.

1. Fish
   Lizard
2. Tectonic plate
   Snake

They really are like dragons. Komodo dragons are Earth's heaviest lizards. Some of them can top 130 pounds, and they sometimes have an aggressive streak.

1. Wind speed
   Height
2. Temperature
   Atmospheric pressure

Barometers are critical tools for measuring atmospheric pressure. As this pressure rises and falls, weather forecasters can generate accurate predictions for a variety of conditions.

1. Much slower but much farther
   10 times slower
2. The same speed
   Four times faster

You think sound travels fast through air? Try underwater -- when submerged, sounds travel about four times faster than those that are above the waves.

1. Air refracts light at a right angle
   Air speeds up light.
2. Air slows down light.
   Air changes the consistency of light.

Light is an energy beam made up of particles. Those particles slow down a tiny bit when they strike air, and even more when they try to pass through water.

1. Oxygen
   Potassium
2. Iron
   Sodium

The most common element in the human body, by mass, is oxygen. Oxygen makes up about 65% of your total mass.

1. Adrenaline
   Nerve cells
2. Blood
   Niacin

Pregnant women must support their own needs as well as those of a tiny fetus. She'll have 50% more blood in her body by the time week 20 rolls around.

1. Fat
   Nitrogen
2. Pure table salt
   Water

In popular legend, camels store water in their humps. But the humps are actually high in fat, which the camel burns when caloric intake is too low.

1. Helium
   Chromium
2. Mercury
   Iron

Mercury is one of just two elements that are liquid at room temperature, one reason it is used in thermometers. The other is bromine.

1. About 300,000 times
   About 1 million times
2. About 3 million times
   About 30 million times

The human heart is an incredible bit of natural engineering. Each year, it beats about 30 million times -- more than 100,000 times every day.

1. An underground product
   A salty snack
2. A foundation of certain food items
   A nut

Peanuts aren't nuts. They're a type of legume … or bean. But if you call it "bean butter" people will look at you funny.

1. Raccoon
   Bear
2. Brown recluse spider
   Dolphin

Dolphins emit a vast array of clicks, whistles and other sounds. Those sounds are often an aspect of echolocation, in which the sounds bounce off underwater objects and return to the dolphin, which uses this information to locate various prey or obstacles.

1. Hydrogen
   Sodium
2. Helium
   Gold

Hydrogen, sweet hydrogen, is the most common chemical element. Without it (combined with oxygen) we'd have no water to drink.

1. Just one
   Two
2. Eight
   About 29

Earth's oceans are crazy deep, on average more than 12,000 feet down. That's roughly eight Empire State Buildings … but there are places more than three times deeper.

1. They can break glass by chirping.
   They have no intestines.
2. They can jump 10 times higher than their height.
   They blink one eye at a time.

Almost all animals blink … and most of them move both eyelids at once. But hamsters are odd, blinking just one eye at a time, giving them a cute winking look.

1. About 10%
   About 30%
2. About 80%
   Nearly all

The human body can withstand massive blasts of voltage -- about 90% of strike victims survive. Sadly, many of them experience permanent suffering from the strike.

1. Severe bleeding
   Incredible pain
2. No real reaction
   Immediate death

Platypus venom is an odd phenomenon in part because so few mammals create venom of any kind. When it hits a human, the stings are very painful but not lethal.

1. Close to a decade
   About three years
2. Maybe a month
   More than half a year

Mars is a tantilizing destination for many scienists. If astronauts do get to blast off for Mars, it will take them more than half a year -- or even eight months -- to get there.

1. Around 1,000 degrees Fahrenheit
   Around 600 degrees Fahrenheit
2. Around 12,000 degrees Fahrenheit
   Around 54,000 degrees Fahrenheit

Lightning kills about 50 Americans each year … so you know it's deadly. It's also hot -- about 54,000 degrees Fahrenheit.

1. It layers various type of keratin.
   It's resistant to antibiotics.
2. It has super tough walls.
   It's a type of storm.

A supercell is a notorious type of thunderstorm. Supercells can pummel the Earth for hours on end, spitting hail, lightning … and tornadoes.

1. Gases
   Liquids
2. Metals
   Fire

We humans have discovered 118 elements. Roughly three-quarters of those elements are metals, many of which we use in vital tools in our everyday lives.

1. Every two hours
   Every two weeks
2. Every two months
   Every two years

Dolphin skin is amazingly smooth and soft. Why? The creature quickly sloughs off old dead skin cells, regenerating them every few hours.

1. Explosive elements
   Mammal anatomy
2. An inverted wormhole
   Phases of matter

At just the right combination of pressure and temperature, some elements reach their "triple point," in which they exhibit traits of gas, liquid and solid … all at once. In many cases, the triple point can be created in lab environments.