"What is this weird, hard thing inside my cara cara orange?"
A: "The navel in navel oranges is actually another baby orange that’s been overrun by its larger brother. Sometimes the runt orange grows strangely as the two oranges grow together."
"They're oil absorbing pads and since oil floats on water the tube is there to stop the oil from flowing while letting the water pass under it"
I had to visit reddit to look it up... I feel dirty.