They tested on a Formlabs and a Stratasys Dimension Elite. The Dimension is an ABS plastic, the formlabs SLA printer is Methacrylate Photopolymer Resin. I'm feeling okay about my PLA printer.

Dear Abby,

    Ever since we got my 13-year old an iPad, he's gone up to his bedroom after dinner each night and asked us to not disturb him while he "creates a document." Today I learned from Bill Gates that he can't actually create a document.

    Should I knock before entering his room to ask about this?

If you know Hal Abelson, then you know this won't be a CYA investigation.

It may not work for you but I really like the Zebra F402 and have used them ten years without unhappiness.

when these countries stop believing in evolution.

Just asked my kids: 12 year old boy, 10 year old girl. I asked them separately. Each looked at me like I'm stupid (okay, maybe that's accurate) and said, "Yes."

They mainly program Scratch and Kodu but I'm installing App Inventor later today.

My kids don't mind programming. They both used Alice http://alice.org/ and were meh about it and didn't go back (about two years ago).

They both like Scratch http://scratch.mit.edu and the 12 year old has moved on to building his own blocks in the Squeak interface underneath it -- so as a starter language I think it has done exactly what we'd like it to do. He's now looking forward to learning python, probably using the media computation materials from Guzdial/Ericson.

The 9 year old actually prefers Microsoft's Kodu http://research.microsoft.com/en-us/projects/kodu/.

I'm thinking about working them through some of the material at Bootstrap http://www.bootstrapworld.org/ which is teachScheme for kids.

The poster is missing the real miracle here. Pope Benedict XV died in 1922.