• ### What is the product of all the positive real numbers?

3 answers · Mathematics · 2 days ago
• ### Is there a particle made of 3 down quarks? If not, why not?

(uud) is a proton with a charge of +1. (udd) is a neutron with a charge of 0. Why isn't there a (ddd) with charge of -1? {Note: this is not the antiproton. That is made of antiquarks. }
(uud) is a proton with a charge of +1. (udd) is a neutron with a charge of 0. Why isn't there a (ddd) with charge of -1? {Note: this is not the antiproton. That is made of antiquarks. }
1 answer · Physics · 2 weeks ago
• ### In soccer, a win = 3 pts and a tie = 1 pt. So why don't teams agree to determine a winner instead of accepting a tie?

A win and a loss is better than 2 ties. Why don't teams agree to play the last minutes of a tie game and overtime without any goaltenders? That would make it much more likely that one team would win. In the long run, this strategy will benefit both teams.
A win and a loss is better than 2 ties. Why don't teams agree to play the last minutes of a tie game and overtime without any goaltenders? That would make it much more likely that one team would win. In the long run, this strategy will benefit both teams.
• ### Why don't we generate energy with nuclear fusion of neutrons?

The hard part of proton fusion is overcoming their electrical repulsion to get them close together so the strong nuclear force can fuse them. But neutrons have no charge and they respond to the strong force. So why not use neutron fusion power?
The hard part of proton fusion is overcoming their electrical repulsion to get them close together so the strong nuclear force can fuse them. But neutrons have no charge and they respond to the strong force. So why not use neutron fusion power?
2 answers · Physics · 3 weeks ago
• ### Could a spacecraft be put into a stable orbit in which it goes from earth to the moon and back to earth continuously?

3 answers · Astronomy & Space · 4 weeks ago
• ### If you go south from Los Angeles, CA and keep going, what is the first foreign country you enter?

As a challenge, tell me what country without looking at a map.
As a challenge, tell me what country without looking at a map.
6 answers · Geography · 1 month ago
• ### The study of different places and what is there is called geography. But why is it called science if those places are on other planets?

1 answer · Geography · 1 month ago
• ### Are there any mathematical entities that are non-transitive?

I'm looking for something in mathematics in which A > B and B > C and C > A. An example of this is the rock-paper-scissors game. Are there any operations or elements in math that behave in a non-transitive wsy?
I'm looking for something in mathematics in which A > B and B > C and C > A. An example of this is the rock-paper-scissors game. Are there any operations or elements in math that behave in a non-transitive wsy?
8 answers · Mathematics · 1 month ago
• ### How do your soul and brain interact?

Your brain is physical matter and must obey the laws of physics. If your soul is spiritual, how does it create an electrical impulse in your brain that leads to a conscious voluntary movement of your arm? How does the soul control the physical body of a person?
Your brain is physical matter and must obey the laws of physics. If your soul is spiritual, how does it create an electrical impulse in your brain that leads to a conscious voluntary movement of your arm? How does the soul control the physical body of a person?
12 answers · Religion & Spirituality · 1 month ago
• ### Why do all casinos have the same games?

Why don't any casinos have video games that you can win money on? Why not chess or checkers or scrabble or darts? Why not trivia games?
Why don't any casinos have video games that you can win money on? Why not chess or checkers or scrabble or darts? Why not trivia games?
17 answers · Gambling · 1 month ago
• ### In the MLB, how would this replay challenge situation be resolved?

Bases loaded, 2 outs, full count, runners running. A ground ball is thrown to 1st, ump calls him out, other runners keep running. Replay challenge shows he is safe. Does runner from 2nd score? He was half way home when 1st baseman got ball. Does runner from 1st score? The ball was live the whole time? Or does the wrong out call make the ball dead?
Bases loaded, 2 outs, full count, runners running. A ground ball is thrown to 1st, ump calls him out, other runners keep running. Replay challenge shows he is safe. Does runner from 2nd score? He was half way home when 1st baseman got ball. Does runner from 1st score? The ball was live the whole time? Or does the wrong out call make the ball dead?
5 answers · Baseball · 2 months ago
• ### What is the definition of "dimension"?

What exactly does it mean when you say a being came from another dimension? I thought a dimension is a direction, like left or right or north or south. In math, it is the x or y or z direction.
What exactly does it mean when you say a being came from another dimension? I thought a dimension is a direction, like left or right or north or south. In math, it is the x or y or z direction.
3 answers · Paranormal Phenomena · 2 months ago
• ### How can we tell the difference between sleep paralysis episodes and true alien abductions?

Sleep paralysis is a sleep disorder where a person is partly awake and sees his bedroom and partly asleep and sees dream characters. His body can not move in this state. How can a person know for sure if he had this sleep paralysis or if real physical aliens actually took him?
Sleep paralysis is a sleep disorder where a person is partly awake and sees his bedroom and partly asleep and sees dream characters. His body can not move in this state. How can a person know for sure if he had this sleep paralysis or if real physical aliens actually took him?
11 answers · Paranormal Phenomena · 2 months ago
• ### How do you solve an algebra equation with x as an exponent?

For example: ( X + 2 )^X = 50 Solve to find X
For example: ( X + 2 )^X = 50 Solve to find X
5 answers · Mathematics · 2 months ago
• ### What is the total distance that all cars in the world have traveled since cars were invented?

I know this will be just a rough estimate.
I know this will be just a rough estimate.
8 answers · Other - Cars & Transportation · 2 months ago
• ### What are some science fiction movies or tv shows in which the plot includes science (even fictional science) in some way?

"Contact" is a good example of a movie with science in its story. Most sci-fi movies are just war movies in space and have nothing to do with science.
"Contact" is a good example of a movie with science in its story. Most sci-fi movies are just war movies in space and have nothing to do with science.
10 answers · Movies · 2 months ago
• ### How can you prove that pi is irrational?

Is there a simple proof that pi is irrational? I know such proofs do exist. Can anyone summarize that main ideas in the proof?
Is there a simple proof that pi is irrational? I know such proofs do exist. Can anyone summarize that main ideas in the proof?
4 answers · Mathematics · 3 months ago
• ### Why is the earth's gravity easy to feel and measure but the curvature of space caused by earth's gravity is way too small to observe?

General relativity says gravity is due to a curvature of space. The non-Euclidean geometry of space around earth is much too slight to measure. So why is the effect of gravity so noticeable?
General relativity says gravity is due to a curvature of space. The non-Euclidean geometry of space around earth is much too slight to measure. So why is the effect of gravity so noticeable?
5 answers · Physics · 3 months ago
• ### How did God create the universe? "In the beginning, God created heaven and earth." But does the Bible say how?

If you believe God created everything, aren't you curious how He did it? Saying "God can do anything" or "God spoke" or "God waved His hand" doesn't explain HOW the miracle happened. If religion can't explain it, then religion does no better than science. Science can't explain the beginning either.
If you believe God created everything, aren't you curious how He did it? Saying "God can do anything" or "God spoke" or "God waved His hand" doesn't explain HOW the miracle happened. If religion can't explain it, then religion does no better than science. Science can't explain the beginning either.
18 answers · Religion & Spirituality · 3 months ago
• ### If you have 3 babies at once, they are triplets. Would it be correct to call 2 of those 3 kids twins?

Is the definition of twin "a brother or sister born at the same time as you"?
Is the definition of twin "a brother or sister born at the same time as you"?
5 answers · Newborn & Baby · 3 months ago