I believe I have discovered a new fundamental universal force: that between Bolognese sauce and Child B's elbows.
Every way B turns, leans or reaches at the table, their elbow lands in, or drags through, some Bolognese sauce.
Now I need to apply for some funding to investigate further. At the same time I could see if more or less Bolognese sauce lands on B's pullover if the Bolognese is on a spoon, or being fired by a particle accelerator.