• Everything, including light, is both a wave and a particle and the behaviour it shows depends on how it's observed. Particles above atomic scale have such large wavelengths that it's not measurable.

  • Something's position and velocity cannot be measured exactly. The more accurately one is measured, the more the other measurement is messed. There is a theoretical, minimum product of position error and velocity error, which is known as Planck's constant, I think. Fortunately, such unavoidable errors are too small to mess up human scales.

  • Things can't be said to actually have a position or velocity, merely probabilities of being at a particular place or having a particular velocity. They are more like vague, probabilities smears. There can be tiny chance that an electron moves through a barrier, even though it never acquires the energy required to jump that barrier. This is known electron tunnelling and affects microprocessor design.

  • Subatomic particles can spontaneously appear from nothing with its anti-particle. Even a vacuum has a 'vacuum energy' that has subatomic particles appearing and annihilating each other all the time. Sadly, this energy is too weak and too random to be used.

  • The famous Schrodingers cat experiment is merely an idea to show the absurdity of Quantum physics. The probabilities of the vague, wave-particles interact to create vast numbers of possible scenarios, which exist simulataneously until they are observed and collapse to leave just one. By sticking a cat in a closed box and hooking a radioactive particle to break a poison vial, there are two possible scenarios in this case: the particle spontaneously triggers, breaking the vial and killing the cat; the particle fails to trigger and the cat remains alive. The cat is both dead and alive. When the box is opened or the contents otherwise observed, then the possible scenarios collapse leaving just one.

  • Quantum physics underpins modern microelectronics and chemistry. If Quantum physics is wrong, I don't want to know about it.