Yes

All the sudden, one day, we noticed Lucas was nodding his head "Yes" to answer us for yes/no questions. At first we thought he was just answering "yes" to anything. But after a while we realized his responses were fairly appropriate. Now, of course, Ryan had to test this by asking him things like, "Do you want to fly to the moon?" or "Do you want to eat fried worms for lunch?".

Here's a clip of his "Yes" nod for some of his favorite food, crackers.