Fake Coin

By the way, did you know that Albert Einstein's brain was "normal" in weight? For the most part, it resembled an ordinary brain. There was, however, a slight difference. He had extra "cleanup" cells (called neuroglial cells). These cells move around the brain to get rid of dead or injured nerve cells. Perhaps his "well swept" brain supercharged his intelligence? You have nine gold coins. One of the coins is counterfeit and is filled with a lighter-than-gold substance. U sing a balance, what strategy can you use to uncover the counterfeit coin? To make things a little more difficult, you must identify the fake coin with only two uses of the balance.

Answer:

First, divide the coins into three groups of three. Then, balance anyone group against another group. If the counterfeit is contained in either of the groups, the coins will not balance. If, however, they balance, the counterfeit coin must be in the third pile. Now that we have identified the pile with the counterfeit coin, remove one coin from the pile and balance the other two. The lighter coin will not balance. If the two coins do balance, the counterfeit coin is the one not selected.

Brain Net

Brain Net by Michael A. DiSpezio

Your brain is an incredible piece of machinery. About the size of a squished softball, it contains billions of brain cells. These cells make more connections than all of the phones in the world. It's this huge network that produces your brain power! Want to feel the "brain net" in action? 


Take a look at the drawing below. Your job is to figure out how many different paths can get you across from start to finish. 


You can only move to the right. You can't go back. When you arrive at a "fork," take either the top or bottom route. Start counting.

Answer:

Twenty routes. Although you can chart them all out, there is a less confusing way. Starting at the left, identify the number of routes that can get you to a circle. You can arrive at this number by adding the numbers found in the connecting circles to the left. Keep going until you get to the finish.

1 into 21 Triangles

Beginning with an equilateral triangle, can you divide it into 21 acute, strictly isosceles triangles?

Answer:

String of Four Numbers

Find a string of four numbers that is repeated in both the left and right grids. The string may appear horizontally, vertically, diagonally, backwards or forwards in either grid, but always in a straight line.

Answer:

7642 (or 2467)

Dédalo Puzzle

Connect the numbers in pairs by drawing horizontal lines or vertical (not diagonal) that can not cross or pass one on the other lines. All squares of the grid must be crossed!

Answer:

Over the Wall

Answer:

Spirals

Which is the odd one out?

Answer:

C – The spiral turns the opposite way from the others.

Arrange Cubes

Arrange these cubes into four matching pairs.

Answer:

A-C, B-F, D-G, E-H

Which letter completes the puzzle?

Which letter completes the puzzle?

Answer:


O
In each segment of the diagram are a pair of letters, one of which is the same distance from the start of the alphabet as the other is from the end.

Missing Square

Answer:

Sports Fans

Alex, Ryan, and Steven are sports fans. Each has a different favorite sport among football, baseball, and basketball. Alex does not like basketball; Steven does not like basketball or baseball. Name each person's favorite sport.

Answer:

 It might be helpful to set up a grid as follows: We can see that Ryan must like basketball since neither Alex nor Steven does. Steven does not like basketball or baseball, so he must like football, leaving Alex liking baseball.