Future Engineer?

It seems my son has been reinforcing the supports of our stackable tray (those multi-level plastic trays) by shooting pens down the hollow supports. I thought it was a new thing he did, but when I got the pen he slipped there today, I saw 6 other pens!

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Left baby to Ninang's care last night. We got home at past 12. Heard he had crackers and milk before bedtime. Poor darling, he really gets driven to eat more when am not around.