A widget is a hollow, spherical piece of plastic with a tiny hole in it - it looks like a little ping pong ball ... beer, giving it a thick, creamy head you'd get straight from the tap. Guinness ...

Ever opened a can of Guinness and noticed a strange rattling sound when you shake it? There's a foreign object in there. But, it has a purpose. Follow Tech Insider: On Facebook More from Science ...

Bartenders are usually trained on how to achieve the perfect pour of Guinness by using the right glass, angle, and time taken ...

An curved arrow pointing right. Ever opened a can of Guinness and noticed a strange rattling sound when you shake it? There's a foreign object in there. But, it has a purpose. Produced by Kevin ...