Simplify the following text for a Grade 13 native English-speaking person.
Original: These include statistical mechanical effects , as well as quantum mechanical effects , for example the â quantum size effectâ where the electronic properties of solids are altered with great reductions in particle size .
Simplified: For example the effects of very small movements , as well as quantum mechanical effects , like the â quantum size effectâ where electrons in solids move differently for very small sizes of particle .