Jonah rides a bike
Jonah just zipped back and forth, up-slope and down-slope, on Gracie's bike, coming to a controlled stop before bumping into the (upside down, he's in a turn-things-over phase) plastic table.
No training wheels. Much confidence, no "look at me", just ... well ... aplomb and casual panache. Much older sib and parental "Look at this!" and gasping and laughting.