MATH
Sudoku
Riddles
Q: A waitress walks up to a breakfast table
with five logicians and asks, 'Does everyone here want coffee?'
The first logician says, 'I don't know.'
The second logician says, 'I don't know.'
The third logician says, 'I don't know.'
The fourth logician says, 'I don't know.'
And the fifth logician says, 'No.'
To whom did the waitress bring coffee — and why?
A: The waitress asks, "Does EVERYONE
here want coffee?"
If the first logician didn't want coffee,
he knows that not EVERYONE wants coffee so he could have replied
"No." But he doesn't yet know what the others are thinking so he
answers "I don't know." This tells us he wants coffee.
Similarly, the second logician has
determined that the first logician wants coffee. Now we are in the same
situation as the first logician. If the 2nd logician didn't want coffee, he
could say, "No." But because he replies "I don't know." it
means he also wants coffee.
The same logic applies to the 3rd and 4th
logicians.
The fifth logican has determined that all
the rest want coffee. If he also wanted coffee, he would reply "Yes"
because he can accurately determine that everyone wants coffee. However, he
doesnt want coffee and therefore answers "No", because he is the lone
logician that doesn't want coffee and therefore NOT everyone wants coffee.
Summary:
The waitress (being the consumate logician
herself) brings coffee to logicians 1 through 4. Logician 5 is not served
coffee.
Cross Number Puzzle
Across:
1. 3 Down plus 5 Across
3. One-seventh of 8 Across
5. Half of 14 Across
6. A prime number
8. Seven times 3 Across
10. Twice 7 Down
12. A perfect square
14. 9 Down reversed
15. The sum of its own digits,
times thirty-seven
16. A perfect square
Down:
1. 13 Down plus 10 Down
2. Average of 9 Down and 14
Across
3. 1 Across minus 5 Across
4. A multiple of three
7. 16 Across minus 1 Across
9. 1 Across plus 5 Across
10. 13 Down plus three hundred
11. 12 Down minus 1 Down
12. Anagram of 4 Down
13. 1 Down minus 10 Down
SCIENCE
Make an Egg Float in Salt Water
An
egg sinks to the bottom if you drop it into a glass of ordinary drinking water
but what happens if you add salt? The results are very interesting and can
teach you some fun facts about density.
What
you'll need:
One egg
Water
Salt
A tall drinking glass
Instructions:
Pour water into the glass until it is about
half full.
Stir in lots of salt (about 6 tablespoons).
Carefully pour in plain water until the
glass is nearly full (be careful to not disturb or mix the salty water with the
plain water).
Gently lower the egg into the water and
watch what happens.
What's
happening?
Salt
water is denser than ordinary tap water, the denser the liquid the easier it is
for an object to float in it. When you lower the egg into the liquid it drops
through the normal tap water until it reaches the salty water, at this point
the water is dense enough for the egg to float. If you were careful when you
added the tap water to the salt water, they will not have mixed, enabling the
egg to amazingly float in the middle of the glass.
Go to this
website for more funs!
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