Put a new twist on your collection of optical illusion activities. Affix the linked printable spiral to a drill, record player, or some other rotating tool. Have learners stare at the spinning disk for only 15 seconds and then look away....

What a creative approach to studying about the ancient Mayan civilization! Learners will become investigators in the case of the "disappearance" of the Classic Maya by examining a variety of primary and secondary source material,...