photo credit: Fjellanger Widerøe A.S.; image source
This photo (hi-res image) shows water wave diffraction near the northern coast of Norway. To learn more about wave behavior, check out these video simulations of diffraction (at the bottom of the page). For more on coastal waves, see Oceanography: Waves, especially the sections "Waves entering shallow water" and "Wave reflection."
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PhET Simulations: Lunar Lander
Once you have clicked on the "simulation" link below, be sure to read the Java Security Advisory before running the simulation: To do that, click the "Read now" button on the yellow band near the top of the PhET page.
Try your hand at touching down on the moon with PhET Simulations: Lunar Lander. As you play this game, you'll build an intuitive understanding of Newton's Laws.
To learn more about Apollo 11, the first moon landing, visit Apollo 11 at 35.
(This feature was updated on May 5, 2013.)