Q: Why don’t palm trees blow down in strong wind as often as other trees do?

A: I thought this was going to be an easy one, and I was prepared to pad it out with a lot of cheap jokes about my masters.

Instead, it got kind of complicated, so I had to cut out the jokes, which is just as well because I would have had to explain them to my masters anyway.

This is the deal: Palm trees are monocots as opposed to other trees, such as paloverdes or oaks, which are dicots.

Kim Stone, a horticulturist at the Boyce Thompson Arboretum near Superior, went to some pains to explain the differences to me. He is a very patient man.

Q: Why do people paint the trunks of their citrus trees white?

A: HA! At last, a question we actually knew the answer to without having to look it up or ask somebody. It’s to protect them from the sun.

We are soooooo smart.

To celebrate, we asked an actual newcomer in the office if she knew why citrus trunks are painted white, and she said it was to repel insects. These comical newcomers.We were going to laugh at her until we remembered she is much higher up the food chain than us and holds what passes for our career in her elegant and well-manicured hands. So we didn’t laugh.

Just to double-check, and to look busy, we called Ralph Backhaus, a professor of plant biology at Arizona State University.

Q: What exactly causes that fresh/earthy scent when it rains in the Valley? It’s a real distinct scent, not flowery or sweet, but more like a fresh, clean smell.

A: Your question worked its way to the top of the pile at just the right time — Tuesday, when we had that delightful morning rain. As soon as the skies cleared we leapt into the Valley 101 mobile research lab, and set out to find the source of the scent.

You are right. There was a truly remarkable aroma in the air, which we soon traced to a half-eaten Big Mac under the floor mats in the backseat of the Valley 101 mobile research lab. While we would not describe this as “fresh/earthy” it was definitely distinctive.

After a stop at the car wash, we sought advice from the estimable Carolyn O’Malley, executive director of the Desert Botanical Gardens and an honorary member of the Valley 101 faculty.

Here at the Valley 101 Research Center and Windshield Squeegeeing Service, we have amassed a collection of three questions about saguaros, those noble cactuses that symbolize Arizona just as surely as do recall elections.

And we now endeavor to answer these queries with, as always, the help of Patrick Quirk of the Desert Botanical Gardens, who has forgotten more about saguaros then you’ll ever know.