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These are ripple marks in beach sand, made by the wind. Similar ripples can be seen in deserts, and even in large playground sandboxes. What causes the ripples to be so evenly spaced?


I took this photo on the beach in St. Augustine. The Sun had just peaked over the horizon, and formed a bright column of light above it. Why?


I got this photo during our visit to White Sands, and used the sound of the thunder with the Flash/Bang method to determine that the bolt was about two miles away. How does lightning produce thunder?


I took this photo on a boat excursion on the Colorado River. A recent comment asked why the sky is blue. OK, so why is the sky blue? And why is it bluer on some days and less blue on others?

Making a Solar Still

Imagine for a moment that you are stranded in the desert, and running short on water. Or imagine that you are in a boat far out at sea, surrounded by salt water, but no fresh water to drink. Is there any way you could use some science to get something to drink? Of course there is!