Alexis wasn't to keen on the idea and didn't think it was "sciency." She says "Why don't we just cook an egg on the stove?"
Geez...is she missing the point or what? So I say "Because it is 98 degrees and this way we can see if it is hot enough to cook an egg outside!"
This is our egg. We waited about 10 minutes and nothing happened. We even tried directing a beam of sunlight at the egg with a magnifying glass. Nothing happened so we moved the egg to the blacktop.
This is the egg after 10 minutes on the blacktop. Conclusion: It definitely is not hot enough to cook an egg on the sidewalk.