Science Photo of the Day

I thought it was time to bring back the Science Photo of the Day. Enough time has passed that it won't matter if I accidentally repeat one of the old questions, and I have plenty of new photos to use.

If you are not familiar with the Science Photo of the Day, each day I will post a new photograph with a science question. The photos will be posted here and on my Happy Scientist Facebook page. The next day, I will post the answer, along with a new photo and question.

Some of the questions will be simple, while others may take quite a bit of research to answer. Subscribers are welcome to post your answer in the comments, but they will not appear on this site until I approve them (which cuts down on spam, off topic comments, etc.) If you are not a subscriber, you may post your answer on the Happy Scientist Facebook page.

Science Photo of the Day

New Science Photo: 22

The sandstone cliff that surrounds our house on 2 sides has many black patches like these. It looks almost like someone painted the rocks, but it is natural. What is it, and how did it get there?

New Science Photo: 21

After a very dry winter, we finally had some precipitation. Instead of snow flakes, we got these small, round, pellets of soft ice. What are they called?

New Science Photo: 20

There are quite a few small Pinion Pine trees growing out of the rocks of the sandstone cliff behind out house. How did the trees get started growing way up in the rocks?

New Science Photo of the Day: 19

Something clipped many of the branches off of hundreds of sagebrush bushes in the field in front of our house, but did not eat them. What did it, and why?

New Science Photo of the Day: 18

Look carefully at this mule deer's back leg. How is its knee different from ours?