> it was only an unproven theory until Crookes demonstrated that under certain conditions, light seems to exert a force.
And in this particular case, he was wrong: it's about differential heating of the air in the bulb, and goes away when the air is removed.
https://en.wikipedia.org/wiki/Crookes_radiometer
But a more sensitive instrument *can* detect this force:
https://en.wikipedia.org/wiki/Nichols_radiometer
Biting the hand that feeds IT
