Keep Asking
Marshall Brain answers all kinds of questions about the crazy but cool world around us. Learn answers to your questions in the Keep Asking blog.
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Why can a 5 foot 8 inch man dunk a basketball on a 10 foot rim while some people of taller stature can't?
by Marshall Brain | May 4, 2011
You asked: Why can a 5 foot 8 inch man dunk a basketball on a 10 foot rim while some people of taller stature can't? What accounts for the ability to jump so high? Marshall Brain Answered: There are three things that allow a person to dunk a ball: 1)[...] See more »
What happens to our sun once it runs out of fuel?
by Marshall Brain | Apr 29, 2011
You asked: What happens to our sun once it runs out of fuel? Marshall Brain answers: Our sun is a giant fusion reactor floating in space. It is composed mostly of hydrogen and helium. In the sun's core, hydrogen is fusing to form helium. Those fusion[...] See more »
How do we know the age of the universe?
by Marshall Brain | Apr 26, 2011
You asked: How do we know the age of the universe? Marshall Brain Answered: Scientists currently estimate the age of the universe to be 13.75 billion years old. This is the number of years that have elapsed since the Big Bang. But how do they determi[...] See more »
How fast is the fastest microprocessor chip, now and in the future?
by Marshall Brain | Apr 20, 2011
You asked: How fast is the fastest microprocessor chip, now and in the future? Marshall Brain answers: Today, in 2011, the fastest microprocessor chips that are commercially available to "normal people" are the six-core hyperthreaded chips [...] See more »
Is it possible to turn Mars into another Earth?
by Marshall Brain | Apr 19, 2011
You asked: Is it possible to turn Mars into another Earth? Marshall Brain answers: The process of turning mars into an earth-like planet is called - More gravity - More water - More atmosphere - Higher temperatures - A protective magnetic field The [...] See more »
Is USB 3.0 really faster than USB 2.0?
by Marshall Brain | Apr 13, 2011
USB 3.0 is definitely faster at the as-designed level. USB 1.0 maxes out at 12 megabits per second (mbps). USB 2.0 is good for 480 mbps. And USB 3.0 can go as fast as 5,000 mbps. That means that you might expect a USB 3.0 external hard disk drive to [...] See more »
Will humans ever be able to directly control machines with their brains?
by Marshall Brain | Apr 12, 2011
You asked: Will humans ever be able to directly control machines with their brains? Marshall Brain answers: Imagine sitting down at your computer, and you don't need to touch anything to control it. There is no keyboard or mouse because you tell the [...] See more »
Is it possible to blow your nose so hard your brain bursts?
by Marshall Brain | Apr 8, 2011
You asked: Is it possible to blow your nose so hard your brain bursts? --- Zack (via Marshall Brain answers: Can you blow your nose so hard your brain bursts? Probably not. But why not? First, you have this muscle below your lungs called the diaphra[...] See more »
How will graphene change the world?
by Marshall Brain | Apr 7, 2011
You Asked: How will graphene change the world? Marshall Brain Answered: Graphene is a very simple substance - it is made of carbon atoms perfectly arranged as an atom-thick mesh. Think about a net made of carbon atoms, each bonded to its three neares[...] See more »
How do dog whistles work?
by Marshall Brain | Mar 3, 2011
You Asked: How do dog whistles work? --- David, Pomonapark, Fla. Marshall Brain Answers: A dog whistle, if you want to think about it this way, is a musical instrument that produces a single note. The note is very high - so high that most humans cann[...] See more »
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