He truly is a treat, when he isn't driving us crazy. And because I can't share these anywhere else, here are some of my favourite quotes (I started noting them down after a while because there were so many of them) (and I know there are many of them, but I just love sharing these):

4y10m (in response to a joke about pants have legs but can't walk): "But they don't have feet and they don't have blood, so of course they can't walk."

4y10m (after I told him my gelato flavour was salty caramel and Skor, and without missing a beat): "Skor can be used for a name (character in a show he used to watch), a goal and an ice cream flavour."

4y11m: "DS3, you're being Loud Loser". Mommy: DS4, where did you hear that? DS4: "I made it up. Like Rude Randy and Polite Pete. And I'm Quiet Quack." Mommy: Oh, it's really great that you made it up, but maybe we should say Loud Larry instead." (Polite Pete and Rude Randy were characters a child behavioural specialist had introduced to deal with some behavioural issues)

4y11m: "When I grow up, I'm going to have two jobs - superhero and author. Wait. And illustrator, too!"

5y: "Look DS4, the colour tablet is dissolving!"

5y: "I will just pretend I'm a lighter version of myself and I'll float to the surface."

5y2m: "Daddy, your hair looks like a forest" (snow sticking to his hair looked like snow-ladden trees)

5y3m (building Sam (his first robot)): "I just need to make another small adjustment. There, now that's good engineering."

5y4m: “Mommy, did you know that a long, long time ago, meteorites hit the earth, giving us a rich supply of water?"

5y4m: "It looks like a little mouse scurried across the page."

5y5m: "Behold the XT Flyer!"

5y5m: "Mommy, I am looking at the constellations. This is the Big Dipper, cause look..." (Pointing at a picture with a starry sky)

5y5m: "Mommy, how were plants made? No, I don't mean from the seeds and stuff, I mean how was the first plant made?"

5y5m: "Mommy, how does evolution work?"

5y5m: "Mommy, you know if you lost all of your blood and bones, you would just be a big sack of goo and skin?"

5y5m: "After you die, your body goes into the ground and you decompose."

5y5m: “Pretend you don't know where my secret laboratory is.”

5y5m after DS4 said his favourite animal is a turtle but that it’s so slow: "But if a predator comes, it can hide in its shell and it will think it's a rock. It has great protection."

5y6m: "The butterfly is mimicking! Don't let nature trick you!"

5y6m: “Sunday is always “son” day, which is why me and DS4 always party.”

5y6m (as I was helping him with sit-dives): “You made me dive seamlessly!”

5y7m: “Mommy, what causes the tide? Oh yeah, I forgot! It’s the moon’s gravity that pulls the water toward it!”

5y7m: “Do you know why the clouds move? It’s because the wind pushes them. And they don’t move any faster because they are too heavy for the wind to push them any faster.”

5y7m: After daddy said it was like there was a war going on in his tummy: “Actually, there IS a war going on in there between the germs and your white blood cells!”