Here's an interesting game for older kids. Play it on car trips, in a restaurant while waiting for your food, and so on. To play this game, try to make the numbers from 0 to 20 (and beyond, if possible) using exactly 4 fours and any math operations that you can think of. Math operations are things like plus, minus, multiply, divide, square root, to the power of, and so on. The examples on the right demonstrate some ways of making 0 using exactly 4 fours. Remember, you can only use the number 4, and you must always use 4 of the number 4 (no more, no less). We've given you some ideas for making 0, can you make the numbers from 1 to 20 and beyond? It's tricky!

Here's another interesting game to play on car trips, in a restaurant while waiting for your food, and so on. To play this game, pick two four-letter words, such as "WARM" and "COLD." Can you change "WARM" to "COLD" by changing one letter at a time so that you have a new four-letter word at each step? The example on the right shows one way to do it. Try picking two more four-letter words and see if you can change one into the other in this way!

W A R M W A R N B A R N B O R N C O R N C O R D C O L D

Did you know that it's pretty much impossible to fold any piece of paper in half more than 8 or 9 times? Give it a try!

Fold a dollar bill (or any piece of paper) one-third of the way, then attach a paper clip to it.
Fold the other side, then attach a paper clip to it.
Slowly pull the edges of the dollar bill apart. The picture on the right shows the dollar bill when its edges are pulled almost all the way apart.
When the dollar bill is fully straightened out, the paper clips will fly up into the air, linked together! Make sure to aim the paper clips away from people!

This is fascinating, but be very careful since you'll be dealing with fire! First light a candle, and have another flame ready (such as another lit candle, or a lit match, or something similar). Blow out the candle, then quickly place the other flame into the smoke.
If you do it right, the flame will travel down the smoke and re-light the candle!