The Tesla CEO pleads with employees (and, indirectly, to investors) to hang onto their stocks.

Optimus robots have come a long way from their often-mocked introduction in 2021 when a human dressed in a costume appeared onstage for a demonstration. However, while the overall design has changed between the first and second generations of the humanoid bot,

Elon Musk's recent after-hours all-hands at Tesla shows he can often ask more of workers than other CEOs. Yet there might also be limits.