An article from July 2018 gives some hope for this theory; in the article they dispute that gravity is leaking into higher dimensions as in brane theory. However, the article does demonstrate that electromagnetism and gravity share the same number of dimensions, and this fact lends support to Kaluza–Klein theory; whether the number of dimensions is really 3 + 1 or in fact 4 + 1 is the subject of further debate.