Hawking and a Bull

Okay, you're clearly not the sharpest tool in the shed if you're asking a bear to explain this. Stephen Hawking is, or was, a very smart dude, known for his physics brain. 'Charge' means a few things. Bulls 'charge' as in run at you with their horns, but also, like, prices for things are a 'charge'. And Stephen Hawking did research which gets paid for, so he 'charges' too. Get it? It's a wordplay thing!