22. If Dick, who is five feet in height, stands bolt-upright in a swing, the ropes of which are twenty feet long, how much further in round numbers do his feet travel than his head in describing a semi-circle?
No. XX.—OUR BLIND SPOT
Here is an excellent and very simple illustration of a well-known optical curiosity:—
Hold this picture at arm’s length in the right hand, hold the left hand over the left eye, and draw the picture towards you gradually, looking always at the black cross with the right eye. The black disc will presently disappear, and then come into sight again as you continue to advance the paper.
A POSER
23. Can you name nine countries in Europe of which the initial letters are the same as the finals?