The tech firm has said owners may have to re-oil surfaces if the ring marks do not fade.Read more
BBC Radio 5 live
Apple, Google and Amazon all reported results yesterday and there's talk one of these firms could hit the $1tn market capitalisation mark this year.
Matti Littunen, a senior researcher at Enders Analysis, says the firms have big differences in terms of scale and the areas of business they focus on. But there are commonalities.
"All of them have big expectations, addressable markets and global models," he says.
In terms of how they impact our lives, he believes Amazon will have the biggest influence.
"They have perhaps the highest ambitions in terms of covering all areas of the consumer economy - they've just got into healthcare, they bought Wholefoods, their cloud services business is surging ahead."
Many analysts predict that at some point this year, at least one US tech firm will become America's first trillion dollar company. Dave Lee looks at the contenders.
Many analysts predict that at some point this year, at least one US tech firm will become America's first trillion dollar company. Dave Lee looks at the contenders and what they have to do to reach that incredible milestone. Video journalist: Cody Godwin