I found another goof.
When Steven is beginning his book the title "A History of time" is visible, then he adds "Brief". But it should have been, "An history of time." Just saying.
shareIt's not a mistake. Whether or not you use "an" before the word depends on how the word is pronounced, not how it is spelled. You use "an" if the word begins with a vowel sound, but if the word begins with a vowel that sounds like a consonant (for example, union or eucalyptus) it is preceded by "a."
thus,
an apple....an example....an intermission
but
a unicorn....a euphemism....a ukelele
Where "h" is concerned, the same rule applies. "History" is pronounced with the H sounded, but the related word, "historical" may or may not be (depending on local usage.) So we have "a history of the Civil War" but "an historical account of the Civil War." Although, if the H is sounded where you live, writing "a historical account" would be correct, as is the usage, "a historic occasion," which has the H pronounced.
This site explains it succinctly:
http://www.writersdigest.com/online-editor/a-before-consonants-and-an-before-vowels-is-not-the-rule
and here:
http://editingandwritingservices.com/a-or-an-before-words-beginning-with-h/