9/Feb
 SPOKESEach number in the figure below counts how many spokes touch that hub.  Draw spokes in the figure at right so all numbers count spokes correctly. Lines may not cross each other, and all hubs must connect to each other. Puzzle by Dave Tuller Hint: Start by drawing spokes from the blue hubs. |
8/Feb
 MENTAL BLOCKS Which shapes below can be made by rotating and overlapping the two pieces at right? You may not flip pieces over. Hint: Of the six shapes, two cannot be made. |
7/Feb
 COUNT ME INHow many triangles appear in the figure at right, at any size or angle? Shown below is one occurrence. Hint: The triangles appear at three sizes and two angles. |
6/Feb
 DETAILS Find where each detail appears in the big picture.  NASA AND USGS
Hint: Details are same size. Detail 1 is near the middle. |
5/Feb
LOST IN TRANSLATIONThese
song titles were translated by computer to another language, then back
to English, with surprising results. What were the original titles? Hint: Rounds.
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3/Feb
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2/Feb
 GOLD PIECESPlace the gold piece on 4 of the squares of the treasure map at right so every number measures the shortest distance from that square to the gold piece, measured in horizontal plus vertical steps. Do not rotate the piece.  At left is a sample solved puzzle using a different piece. Notice how the numbers show the shortest distances to the gold piece. Hint: The piece is near the upper right corner. |
1/Feb
MAZE The
blue path visits letters in the order BANAAN. Draw a path from start to
end that visits letters in the order BANANA. You may not enter a square
more than once. Hint: Go right to B, then A. Then go to the N on the left. |
31/Jan
TRIBUTE: GEOMETER'S SKETCHPAD  Three
bars pivot at four points. The black points are attached firmly to the
ground. As the blue point traces the circle, what paths do the purple
and red points trace? Note: Bars never collide with each other, even if
it appears that they might.
Hint: The purple arm never angles to the left. |
30/Jan
TRIBUTE: GEOMETER'S SKETCHPAD  A
circle rolls around the inside of a circle twice its size. The blue
middle point travels in a circle. What paths do the purple and red
points follow?
Hint: The path of the red dot is surprisingly simple. |
29/Jan
TRIBUTE: GEOMETER'S SKETCHPADThe fascinating program The Geometer's Sketchpad
from Key Curriculum Press (keypress.com) lets students construct
dynamic figures that roll, hinge, and leave traces when parts are
moved. In the figure below a wheel rolls to the right. The blue point
travels in a straight line. What paths do the purple and red points
trace? |
27/Jan
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