It has recently been confirmed that heat affects the Casimir effect.
The Casimir effect is an odd phenomena that acts to attract bodies together. It occurs at the micro scale and less due to random electromagnetic fluctuations of vacuum (which is everywhere at that scale). These fluctuations give nearby bodies a slight charge, allowing them to attract. The Casimir effect is generally considered a vexing nuisance, as it makes accurate measurements at smaller scales difficult.
