Guwahati, June 8 -- Geoff Beattie, Edge Hill University

It is not a good break-up. These were always two big beasts used to getting their own way. Two alpha males, if you like the evolutionary metaphor, trying to get along. And now the Donald Trump and Elon Musk relationship is in meltdown.

Who could forget that iconic image from just a few short weeks back? Elon Musk standing behind the seated US president, Donald Trump, in the Oval Office, towering over him. Trump, his hands clasped, having to turn awkwardly to look up at him. That silent language of the body. Musk accompanied by his four-year-old, a charming and informal image, or that great evolutionary signal of mating potential and dominance, depending on your point of view.

Thes...