I always have a ton of projects in mind. On my ToodleDo list, I divide projects into those I'm actively working on, those I'm not doing but believe I will do, and those that sound good, but who knows if I'll ever get to them.

I've seen Leonardo Da Vinci notebooks which are filled with tiny, messy scrawls written in mirror image across the page. I'd love to know how he kept all his projects going at once.

I specialize in science and history, with a special emphasis on including do-it-yourself projects in the mix. My dozen or so books have sold hundreds of thousands of copies. I'm also a contributing editor at Popular Science and at Make Magazine.

In my office, I like it quiet, so I can concentrate.

There are interesting scientific and historical connections between these things that I just love.

My home office and workshop are on an overlook on the only deep river gorge on the entire length of the Mississippi River.

I have a large standalone workshop on the back of my property where I prototype and build stuff. It's bright, roomy, and has a giant door so it's easy to bring projects in or out.