So, kudos to Mark Zuckerberg for being bold and knowing a good thing when he saw it in Instagram.

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But knowing that trust has become precious and the ability to deliver it, as Mark Twain once said, is like the difference between lightning and a lightning bug.

FORBES: The of Power Of Trust

His parents Mark Williams and Joanne Parker say they "can't rest" without knowing how their son died.

BBC: Marc Williams death: Family appeal for information

Davis, knowing this uncertainty, may have planned for some of his assets to pass to his only child, Mark.

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It has to be said that Mark Oliphant and his like-minded colleagues seemed to be content to work on the bomb, knowing that it would be capable of mass destruction.

ECONOMIST: Sir Mark Oliphant