Okay, {{field:c3e646f350016e2d}}, we hope your cranium is ready... What gas are light bulbs often filled with?
OK, so what is the largest species of lizard alive today?
If you say so! Now what are the first six decimal places of Pi?
And which planet in our solar system is the hottest?
What is the only kind of rock that floats in water?
Which one of these periodic table symbols is real?
Halfway through already! How are you feeling, {{field:c3e646f350016e2d}}?
Back to the test... What are light-years used to measure?
So, when did Neil Armstrong become the first man to walk on the moon?
And what are the brightest objects in the universe?
OK, Do you know where Marie Curie was born?
Nearly there! What units are typically used to measure electrical resistance?
And lastly, what is vitamin B3 also known as?
Ready to find out the real answers? Incandescent light bulbs are often filled with *neon* or argon. (You answered {{field:7616b6dd34f17482}}._)_
_The inert (non-reactive) gas protects the filament inside the bulb from oxygen in the air, so that it lasts longer before 'burning out'._
*The Komodo dragon* is the largest living lizard in the world. (You said {{field:218dd961226d3765}}._)_
_The giant lizard grows up to three meters long, and has been striking fear into the tiny hearts of birds and small mammals in the eastern Indonesian_ islands for millennia.
The value of Pi to 6 decimal places is *3.141592*. (Your answer was _3._{{field:6d9a15102ae6d9c4}}.)
*Venus* is the hottest planet in our solar system. (You answered {{field:0c45782aafe18a43}}.)
_Even though Mercury is closer to the Sun, Venus is hotter because it has an atmosphere made of carbon dioxide and clouds of acid inside its atmosphere. Not a nice place for a vacation, even if you could go._
The only kind of rock that can float is *Pumice*. (You answered {{field:56f136fc69604f98}}.)
_Pumice is created when a volcano erupts and the molten hot lava interacts with cold air in the atmosphere, creating a super light rock structure that's up to 90% air bubbles. (This is why it looks like a sponge.)_
*Lu - Lutetium* was the only real element symbol in the list. (You said {{field:70c709fa551d8715}}.)
_Lutetium is a rare earth metal which resists corrosion in dry air. Due to its price tag of around US$10,000 per kilogram, it has few commercial uses._
Light-years are a common measure of *distance* in space. (You answered {{field:aabe3181ab71557f}}.)
_Since space is so massive, regular measurement units aren't very useful. A light-year is the measure of how far a beam of light can travel in one year. Light moves at a velocity of about 300,000 kilometers each second, so one light-year is about 10 trillion kilometers._
Neil Armstrong became the first man to walk on the moon on *July 21, 1969*. (You answered {{field:e0acaca2cb4bd346}}.)
_Apollo 11 was the first spaceflight that landed humans on the Moon. American astronauts Neil Armstrong and Buzz Aldrin landed on July 20, 1969, and Armstrong became the first to step onto the lunar surface six hours later on July 21, 1969._
*Quasars* are the brightest objects in the universe. (Your answer was {{field:9016ed3d1750aacc}}.)
_Their luminosity can be 100 times greater than that of the Milky Way, and are thought to contain at least one supermassive black hole. No big deal._
Although she later became a naturalized French citizen, Marie Curie was born in *Poland*. (You said {{field:ffa6d48913496b3a}}.)
_She is known for her pioneering work on radioactivity, and as the first woman to be awarded a Nobel Prize. (In the field of physics.) As if that wasn't impressive enough, she went on to win the Nobel Prize in Chemistry one decade later._
*Ohms* are the unit normally used to measure electrical resistance. (You answered {{field:319cc1fa1b3ebb71}}.)
_The unit is named after German physicist Georg Ohm. You may know him from Ohm's law; the equation describing the relationship between current, voltage, and resistance._
Vitamin B3 is also known as *Niacin*. (You answered {{field:5838acc78f889e0b}}.)
_It's considered one of the essential human nutrients, and is used as a supplement to treat hypercholesterolemia (high cholesterol) and pellagra (niacin deficiency)._
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